One of my Sims invited a friend from school, Jason Ursine, to the prom. He showed up at her door with his inappropriate old mooch of father and then they all stood around on the porch for a while waving their arms in an 'I can't get through' way and shouting and forgot what they were doing (I think he's Absent Minded but she's not, so I don't know what was going on there) so I sent her to Prom alone.
While she was there I kept getting 'Jason is really impressing Regan by bringing her punch' and 'Jason asked Regan to go steady' messages, but all the time Jason was standing on the porch chatting to his father, who finally wet himself and went home. Maybe he's got an evil twin who went to the prom in his place...
(His father, Nicky Ursine, was born early on in the game and really surprised me because every time I've played Sunset Valley before the Ursine baby came out female.)
Oh, and I love Bella and Leila! So funny!