A nice drum set, or even a pair of bongos are always good revenge.

You must love your sister, for she is evil....

We enjoyed giving that little Playskool popcorn popper with a handle... kids can run circles bare on the carpet while making the most annoying Pop! sound ad nauseum, and with the handle they can even take a whack at one another from a head-start range of about three-and-a-half feet. Enjoy, dear nieces, enjoy, dear nephews!

Once a gentleman gave one of my children a tin whistle--a veritable invention of Satan, sir, and one which I have an unspeakable horror of, and so would you if you had eighty or ninety children in your house. But the deed was done--the man
escaped. I knew what the result was going to be, and I thirsted for vengeance. I ordered out a flock of Destroying Angels, and they hunted
the man far into the fastnesses of the Nevada mountains. But they never caught him. I am not cruel, sir--I am not vindictive except when sorely outraged--but if I had caught him, sir, so help me Joseph Smith, I would have locked him into the nursery till the brats whistled him to death. By the slaughtered body of St. Parley Pratt (whom God assail!) there was never anything on this earth like it! I knew who gave the whistle to the child, but I could, not make those jealous mothers believe me. They believed I did it, and the result was just what any man of reflection could have foreseen: I had to order a hundred and ten whistles--I think we had a hundred and ten children in the house then, but some of them are off at college now--I had to order a hundred and ten of those shrieking
things, and I wish I may never speak another word if we didn't have to talk on our fingers entirely, from that time forth until the children got tired of the whistles. And if ever another man gives a whistle to a child of mine and I get my hands on him, I will hang him higher than
Haman!

---- attributed to Brigham Young by Mark Twain in "Roughing It"

Drums, indeed. I'm told that when I was a only wee toddler, my aunt bought me a kiddy drum kit with sheet-metal heads, and that it disappeared later that day.