“Sundown” (*1/2 out of four) was a tiresome teen comedy about two partying high-schoolers (Devon Werkheiser and Sean Marquette) who go on Spring Break to Mexico in search of girls and good times but become embroiled with an underworld gangster after one of them sleeps with a girl at a club (and don’t ask) she steals his family heirloom. Lame rip-off of “The Hangover” is as dumb as it is contrived and goes on forever at nearly two hours. A few fun party scenes liven things up once in a while but duds like this are enough to make you want to join A.A.