There was a storyline back in 2005 where Kurt Angle stalked Booker T's wife Sharmell because he apparently had an addiction to guttersluts (not painkillers, as was the most prominent theory). During the feud he cut a promo saying how he wanted to have dirty bestiality sex with Booker T's wife, which as far as I'm concerned is right up there with Austin 3:16 in terms of memorable and influential promos. On another episode of SmackDown there was a backstage segment in which it was implied that Kurt Angle attempted to rape Sharmell (and possibly succeeded). As I recall the feud culminated in a HUGE grudge match between Angle and Booker at Judgement Day.
Overall, the storyline was great. Kurt Angle was a likeable protagonist who the fans could easily relate to and empathize with.