Listed in order of importance to my son. Maybe you can guess why.
My desk (which is really cute when it's not a mess, but you can't see that here).
Ikea kids mini-picnic table
Dining room table
The cute red one. (The only table, besides the butcher block table in the kitchen, that he finds impractical.)
Let's just say he spends more time under these than in the restroom. Doing his bidness. And, yes, he gets stuck repeatedly under the mini-picnic table.