Nothing makes me so ridiculously happy as happening upon "Ramblin' Man" by The Allman Brothers on the radio. I mean, I own the music, but cueing it up at home is nowhere near as cool as just being in the right place at the right time for it on the radio. Sometimes I don't even make it through the whole endless guitar solo at the end, but I always loudly sing, "I'm on my way to New Orleans this morning, leaving out of Nashville, Tennessee. They're always havin' a good time down on the bayou, Lord, and them Delta women think the world of me," like I believe every word is the truth.
I know I'm not the only one who gets all happy at random songs on the radio. Which one(s) make you go, "Sweet!" (or, if you're a Skynyrd fan, "Turn it up!")?
(Ooh! Speaking of Skynyrd, "I Know a Little" has the same effect.)