Joke
 

Whats the hardest part of a vegetable to eat??

the skull?

the wheelchair

I think you screwed up on the delivery, if it's the joke I'm thinking of.....

I'll guess that it is, and say the wheelchair.

how did i mess up the delivery? i copyand pasted

Well the wheelchair isn't actually a part of the vegetable.

Damn. I went immediately went back to edit my post and add wheelchair as another answer, but then I had CSfilm's thought.
Not part of the vegetable.
I also thought that a vegetable doesn't generally get around in a wheelchair.
Hell, he doesn't get around at all. So the answer is what? Hospital bed?

q: What is the hardest part about eating a vegetable ?

a: getting him/her out of the wheelchair.