Basement

All he wants to do is go in the basement [that's the basement door, hence the child-proof handle he can't open]:

And dump out a bin of toys (all my bins are VERY well organized [in theory]: animals, musical instruments, balls, etc., and no, they never ever get mixed up) (ha) and say "Mommy, help please, clean up time" OVER AND OVER AND OVER until I help him clean it up. Repeat. Repeat. At least he also likes to play air hockey, so occasionally I get a reprieve of "BRUDDER! AIR HOCKEY PLEEEEASE!" Brudder usually obliges.