Lest there be any doubt that John and I are, in fact, giant children, here's our new favorite thing:
We found it at the dollar store, and were immediately intrigued by the promise of "self-inflating" balloons.
There are four in each pack, which is nice, because whacking the first one is completely terrifying. We scared ourselves and the cats, then ended up laughing like loons when it finally exploded.
By pack #4 we were pros, though, and decided to take a little video for posterity:
The balloons are filled with sodium bicarbonate and a vial of citric acid, so you can hear the chemical reaction hissing long after the initial bang.
John's gone back to buy two more packs so far (there are more designs), and we've experimented with snapping the vial in our hands instead of just smacking it, which works even faster/better.
This has been another episode of two grown adults (and two long-suffering cats) keeping themselves - and the neighbors - entertained.
Now, who wants to whack some balloons?
(Check your local dollar stores; ours was at a Dollar Tree.)