How would you react to a friend wearing diapers?

What would you do when you are hanging out with a friend, he drops something and while he is bending down you notice a diaper sticking out between his pants and sweater?
I would find it funny but try to keep a straight face
I would try not to laugh but tell my other friends about it afterwards
I would laugh on the spot
I would feel sorry for him and ask why he needs to wear them
I would not react and I would not say anything
Something else
Select gender and age to cast your vote:
How would you react to a friend wearing diapers?
Post Opinion