You can take "weird" as different, unique or whatever along those lines, whatever makes you feel like you stand out in whatever way you think.
I'll start:
Firstly I have a weird habit of chewing strands of my own hair when I'm concentrating, and trust me, eating your own hair like a cow in public isn't something you want the whole world to see.
Also I never wear panties. I always wear my boyfriend's boxer shorts. Why? Because they're so damn comfortable compared to panties and they stop my ass from freezing.

When talking with friends about something that I don't find interesting at all, I'll always say "Did you know that [insert something that has no link with the latest subject]".

I have an extensive knowledge on sharks because they are my favorite animal.

I sleep only in my pantsu because it's so hot in the summer;;;;;;;;;;;;

I wear 2 pants of different length and type everytime I sleep. Longer one inside, shorter one outside.

Quote from Mantha

I have an extensive knowledge on sharks because they are my favorite animal.

I sleep only in my pantsu because it's so hot in the summer;;;;;;;;;;;;

I know a friend who knows the former and a friend who does the latter XD

I can tickle myself. But no one will ever believe me because whenever I do it for them, they think I'm faking it.

I wear only my PJ bottoms and sleep topless because it's just better that way.
I have a good understanding not if too much understanding of Wolves and Wolf packs. I'm obsessed.
I actually work well under pressure and with less time left.
I feel nothing when someone actually cries in front of me.
I bite my lower lip when concentrating.

For some reason i have the sudden urge alot to just cough. Force myself to cough. For some reason.

I have never mourned. Not when my father passed not when my two grandfathers did never have.

Like apex, I also bite my lower lip when concentrating.

When I draw,I stick out my tongue to be comfortable.My imagination is EXTRAORDINARY.

Quote from Frost10114

When I draw,I stick out my tongue to be comfortable.My imagination is EXTRAORDINARY.

When I draw, I squint at the paper.

At school sometimes I'll be alone, thinking, and people will ask me what's wrong as if I'm depressed.

I have this really weird habit of talking to myself in front of my mirror about anything. School, thoughts on the world, politics. Sometimes even scenarios that have never and probably won't happen.

I have a spot of grey hair on top of my head, I think the word in english is pigmentation, but I don't know for sure.
I often feel the need to guess women's bra sizes, sometimes I just want to kiss with a girl so I can use my hands for a more significant analysis. I wouldn't call it an obsession but it's kind of an habit.
When people tell me someone has died in a car accident I can react very indifferent. But when I'm at his or her's funeral I am the one who cries the most, even if I don't really know the person.
I do not believe in god, yet when I mercy kill a rodent or bird which my cat has wounded I give it a proper burial.
Sometimes I ask girls if they want to join me outside or go to my apartment, I don't intend to do anything with her, I just want the confirmation that I am capable of scoring girls.
I see myself as a true romantic, even though I use the most cheesiest lines in the history of mankind.

When I wear a long sleeve jacket, the sleeve on my left arm is always rolled up and the one on my right is dangling around. Sometimes I just roll up a tissue paper and chew on it when I'm thinking. I also tend to walk around the whole place when talking or thinking. Also when I think or concentrate on something I lose most awareness of what is around me, just the thing in my head.

I have a problem with dancing too much.
I really really am obsessed with food. I'll spend hours just looking at pictures of food online.
When I'm working out and listening to music, I create my own music video for the song in my head lol.

I give mt tongue some fresh air when I'm concentrated.

I'm really random when having a conversation, I can come up with a topic that has nothing to do with the current one.

Don't know if weird but I feel it makes me kinda unique, I'm extremely optimist in some situations, is really hard that I get depressed by something.

I tend to frown a lot when I'm thinking about something important. It isn't really very handy when I'm thinking deeply and the person across the table thinks I'm going to kill them.

Quote from Firefly

I really really am obsessed with food. I'll spend hours just looking at pictures of food online.
When I'm working out and listening to music, I create my own music video for the song in my head lol.

I do both of those as well, I thought I was all alone there, haha.