Mamma Mia! (2008)

A Greek island, a wall-to-wall ABBA soundtrack and a 20-year-old bride who has secretly invited all three of her possible fathers to the wedding. It is the sunniest vacation film on this list, and the one most likely to get the whole room on its feet by "Dancing Queen." Nobody watches it for the singing voices, and Pierce Brosnan's drew the most teasing. The appeal is Meryl Streep and her friends throwing themselves at every number with no embarrassment at all, which is exactly the energy a post-exam night needs. It also works for friends who find crude comedy a turn-off.