Oh right. Pop soda.
My turn.
Backstory: Back in my college days, my friends and I used to watch Pulp Fiction repeatedly and quote the movie lines to each other, especially in everyday situations. Before we talk to someone we hated, we'd say "Lets get into character." When we need to get out of a conversation, we'd say "My names Paul and this shits between y'all". Other favoured lines were "Fuck pride", "I'm a mushroom cloud layin motherfucker, motherfucker", "The car didn't hit no motherfuckin bump", "Does he look like a bitch?", "Hamburgers, the cornerstone of any nutritious breakfast", "Lets not start sucking each other's dicks quite yet" and that perennial favourite, "Naw man, I'm pretty fuckin far from ok."
The incident: A friend of mine had his parents staying over at our place because they were visiting all the way from the Morocco. They were a reasonably conservative family and we had been instructed by our friend not to reveal to them that he (or his friends) were getting drunk, having girls over and certainly not stoned. They even frowned greatly upon foul language as it was an indication of being a bad influence on their son. Unfortunately, I had forgotten my wallet at his place the previous night and went back early in the morning to retrieve it from him. Unbeknownst to me, his parents had JUST arrived. When he asked me which one my wallet was, I absent-mindedly said out loud "Its the one that says Bad Motherfucker". I heard a loud, sharp gasp behind me, and turned around to come face to face with his mother, who proceeded to speak to my friend very harshly in Arabic while I left in a hurry.