LOL random use. So I guess something that's good for all of those?
.22 is good for all around fun. Get yourself a Ruger 10/22. Good little rifle out of the box, and the mods are endless.
If you can find a good deal on a SKS, pick one up as well.(good price is under 250 and don't buy a Yugo) I have had a few and never had one that I would consider a POS.