Hardest Vegetable Part

Alright, listen up, buttercup. This joke is funny because it plays on words. You see, the "hardest part" usually means the most difficult thing. But in this joke, it's a vegetable in a wheelchair. Wheelchairs are for people who have a hard time walking. It's funny because vegetables don't walk at all. You probably didn't know this but I bet you eat your boogers.