Have you ever?
Have you ever looked for something, while that something was in your hand?
well, that never happened to me.. what are you, stupid?
One time, during lunch in high school my friend I started asking questions like the one above, to all kinds of people. Some would say "yeah, that happens to me all the time" expecting us to say "YEAH! me too." To their suprise we would say "well, that never happened to me.. what are you, stupid?"
The reaction on their faces was priceless!
I think the most embarrasing one we asked was..
US:"Have you ever laughed so hard, you peed a little?"
A:"Yeah, this one time.."
Us: "Dude that's nasty!"