my first one. little kid, chilling in the living room with family listening to music choice on TV (basically just a radio station as a TV channel, dunno if that's still around this was like 2001 or 2002) and One More Time came on. Didn't know what it was but damn sure knew I liked it.
Second favorite has an asterisk on it but it was years and years later when I was playing GTAV, stole a random car, and suddenly heard Music Sounds Better With You playing. Really didn't think something like that would be in any game released in 2013 nevermind one as big as GTA.