desertrat
0_0
I used to put baking soda in a bottle, add the vinegar and cork it. Shake well and wait for the bang.
That reminds me of the time when I was a kid that we paid this other kid a buck if he'd eat some baking soda and then take a swig of vinegar. I think we nearly killed him! There was foam shooting out his nose and mouth. We were laughing so hard we couldn't even run away when he finally started slugging us.