I have a feeling people like Chris don't like vegetables because cartoons told them they weren't supposed to at a young age.
Mushrooms are fungi, though. That's completely different, and an affront against God. Not for eating, oh, no.
Brussells Sprouts are good if prepared right (read: swimming in butter or cheese). Little cabbages, essentially. And I agree with your trilogy of crappy "a" vegetables, uh... you. Whoever posted that. Cauliflower is good, though, and I don't know how ANYONE could possibly not like onions, especially when sauteed...
EDIT: <b>OH I ALMOST FORGOT THIS IS OF VITAL IMPORTANCE:</b>
cucumber