Christmas crackers (UK thing)
We put a tiny explosive (very small amount of explosive), a naff/corny/terrible joke, a gift (reflecting the cost of the Christmas crackers which always come in multi packs, posh crackers, posh gift, cheap crackers, cheap gift), a paper hat like a paper crown as seen in The Who's Tommy (1975)
and shove it all into an old loo roll/bog roll/toilet paper roll. We then wrap the whole thing up so it looks like a gift. It's a game of sorts; You're meant to pull your Christmas cracker with somebody else
and whoever ends up with most of the Christmas cracker once pulled is the winner and gets all the contents of the toilet roll/Christmas cracker.
... It couldn't be more simple.
Also, it accompanies Christmas dinner
or can be stowed in a tree (Christmas tree).