Uhh... everything.

Unfortunately they are so adorable asking for anything that I say yes... even if I say add it to the next holiday list, they definitely get it for the next holiday.
They are really convincing when they want stuff. Like they will reenact a whole commercial or state why their life would be so much better with it. Fortunately they are really appreciative and do frequently use most of what they get.
My husband's bad with Hot Wheels. They have around 200, but still get a new one any time we're at a store and they ask. They have a lot of fun choosing them. I'll admit they have way more than enough of those and of books.