Broke into my house, destroyed half a dozen chests in my basement, and then actually proceeded to break into my IRO vault.

The hilarious part is that that took her over 4 hours, and she essentially got one nearly-broken diamond pickaxe and one pearl XD

I think it would have been more efficient for her to go farming and/or mining, TBH... :P

EDIT: And, just one hour after posting this NoMoreHero51 breaks in, spends over an hour destroying the chests I had replaced, only to discover that they are - surprise - still empty. Well, except for the diamond pickaxe I replaced XD

I now put up a sign asking future thieves to please break through my walls in places where there are no torches, because seriously, that's the most annoying part :P