Reminds me of the episode of Will & Grace I saw last night. Every time Will goes to visit his Mom he buys show tickets so that he'll have an excuse to leave early. He says you go to Mom's house, you leave in time to make an 8:00 curtain call for Mama Mia, then you can't get Dancing Queen out of your head for a thousand years.
(Then Jack says "We haven't seen Mama Mia in almost 3 weeks!" Will says, well, actually, I went about a week ago. Jack says well, to be honest, I went twice yesterday.)
As a Mama Mia addict myself, I just had to share that. I fell off my chair laughing.