(Most of the time it isn't even something that is his. He asked me that when he noticed a new trashcan in our bathroom).
"Will this get me a popcicle?"
(We've implemented a barter approach to treats. You eat this much chicken - you get a popcicle).
"Watch this cool trick"
(Adapted from the cool tricks segment of his favorite show Yo Gabba Gabba).
"But..."
(He has an excuse or reason for everything and most of the time it doesn't even make sense! Such as "Trey don't jump of the couch.", "But I need to so I can feel better.")