It's not easy to make a great sequel. Not only is it hard to capture magic twice, but it's always tempting to simply repeat a winning formula. But sequels are almost guaranteed box-office hits, so they keep coming. Think of Liam Neeson and the Taken movies. At first, he laughed at the idea of a third movie in the series. "How many times can she be taken?" he asked. "I mean, that's just bad parenting." Well, as we speak he's filming Taken 3 for a reported $20 million. The plot isn't public yet, but it's almost certainly ludicrously stupid beyond belief. We asked our readers to select the most disappointing sequels of all time. Click through to see the results.