We are near the height of the summer movie season right now, and overall it's been a pretty good year for Hollywood. Transformers: Age of Extinction and X-Men: Days of Future Past have made an absolute fortune, but it's always more fun to talk about the bombs. Studios are quite willing to spend upwards of $300 million on a movie if it means they might make $1 billion — so when something bellyflops it can hit the ground especially hard. Many of the biggest summer box office disasters have hit during the past two decades. Here's a look at 15 of them, complete with budget and worldwide box office grosses (per BoxOfficeMojo.com). By Andy Greene