6. Alvin & the Chipmunks: Chipwrecked (2011)
The Chipmunks and the Chippettes get into all sorts of hijinks on the high-seas in the third installment of the Chipmunks trilogy. We agonized over whether to rank this higher or lower than the "Squeakuel," until we finally decided that these two titles are a tie in terms of terribleness.
Ultimately, Chipwrecked is worse because it was less profitable, only making $350 million. Instead of ever watching this film, read David Cross' account of working on Chipwrecked, a.k.a. "the most unpleasant experience" of his career.