Top 20 Worst Summer Blockbusters

Maybe it's the heat, but there's something about the dog days of summer that sends people running to bad blockbusters in droves. TIME takes a look back at the worst big-budget flicks of steamy seasons past.

1. Transformers: Revenge of the Fallen (2009)

Online plot summaries for this Michael Bay-directed sequel are pretty long, as plot summaries go. But it is entirely possible to read them several times, watch the movie with subtitles, and still be hard pressed to describe exactly what happens. So that's a problem. (Also, there are racist, jive-talking robots named Skids and Mudflaps.) Though fans of the hugely successful first film — based on the 80's Hasbro toy line — eagerly awaited ROTF's release, even the most die-hard Optimus Prime partisans were disappointed by Bay's willingness to sacrifice any semblance of story in favor of more and larger explosions. Rolling Stone's Peter Travers put it best when he wrote, "Transformers: Revenge of The Fallen is beyond bad, it carves out its own category of godawfulness." The movie grossed $836,297,228 on the backs of confused moviegoers.