I’d give laser pointers to Neanderthals. Even if they did figure out some useful application for them (maybe hunting?) they’d run out of batteries eventually.
Furbies. Just to see if we end up with a furby based religion.
After further consideration, I would also give them a Solar-Powered TV that plays nothing but a Video of Hatsune Miku doing Fortnite Dances
A coke bottle
Drop it from an airplane. Bet they would then say among themselves:
God Must Be Crazy!
Sharpies. Think off all the confused scientist that have to explain sharpie marks under acient paintings.
To fuck with? Contraceptives, obviously!
Nuclear bombs
Cool Ranch Doritos
A copy of Windows Vista
Slinky
I always thought it would be funny to take aluminum foil back in time to see the reaction. I mean, imagine if a time traveler showed you a roll of platinum that they use to bake cookies. That’s basically what aluminum was for almost all of history.
Meth
Walkie-talkies would be fun. They’d figure out how to use them pretty quickly and what they could use them for. At the same time they’d be completely like magic to them.
Antibiotics
Give them a 1/2 meter cube of stuff. Tell them its a device that summons god. Only true believers can do the ritual, heretics will die.
I pretend to pray, my partner flies in with the FG 204, 2nd Edition Ver. 2.31, I leave.
Its just a block of plutonium. Trollolol
(Sorry, my evil alter ego took control, I wouldn’t actually do that, that’s so fucking chaotic evil)