I love the acidic sugar they use for sour patch kids. Once I bought some of the by-the-pound stuff from the grocery store, and got, like, 1/4 lb. of the pure sugar. It ate holes in my tongue
. I held my tongue out in the mirror and there were dozens of little blood droplets on it. I couldn't eat salt for weeks.
Highly recommended. I'd totally do it again, lol.