To prove he wasn't a chicken!
or
Weeeeeeeeeeeeeeeeeeeeeeeeeee
or
Because they don't want to give away their presence.
or
It’s a little fishy.
or
Just one more, guys, I promise.
or
None. You have to replace the whole motherboard.
or
Two. One to do the screwing, and one to hear the confession.
or
Does it have to be a light bulb? I've got this neat candle holder...
or
A living room!
or
Because his feet stink
or