There's never been a challenge that I thought was worth that I've half-assed and haven't put everything into. From starting my first (failing) company at 15, to the umpteeth attempt right after graduating college that's going strong nearly 7 years later.
Or a 100 mile bike ride, participating in eating contests, or raising a dog on my own--this has possibly been the most challenging of them all (now I understand the whole single parent thing)!
I have a knack at memorizing random facts, football stats, lines from musicals and every Sex and the City episode, while doing a Rubik's cube.
I've been in San Diego for nearly 5 years now after living in LA and the Bay Area, and have loved every second of it so far. I love the rare instances when I'm allowed to be lazy, either just idling at home or at the beach.