I did almost all of them when I was a kid, except superglue my fingers together. I had a few pocket knives but my favorite was the Swiss Army knife. This is what I use today to void product warranties:

Leatherman Juice XE6

Without further ado, Gever Tulley's "5 Dangerous Things You Should Let you Kids Do":

And here's 5 more things your should let you children do, according to Tulley: