I used to play the trumpet in school which I hated. As far as self teaching, I've learned a little bit of the piano and attempted briefly (but failed) to learn to play the viola. I've always wanted to go back to a string instrument and learn to play. I love classical music, so it would be fun.
However, the instrument that I play nowadays is the guitar (electric and classical). Though I must confess, I've been a bit lazy as of late. At the moment, I'm a bit frustrated with trying to master the "chaconne", so I've been going back to electric while I'm still angry at Bach, lol. Still, there is something about classical guitar that moves me more than any other music. Well, one day I'll be a lesser segovia, lol. In any case, I have improvement to make on the electric, so my time is still being invested wisely.