The final day of Lollapalooza, which featured long-standing big-timers the Foo Fighters, was a serious endurance test for rock fans, who had to deal with an onslaught of rainstorms that put a literal damper on the entire festival. Taking place in two installments, the storms transformed Chicago's Grant Park into a giant mudpit, a Mudapalooza of sorts. However, since such a silly thing as inclement weather couldn't possibly ruin a festival that's been going strong for 20 years, the Lolla punters reacted by dancing, sliding, and rolling around in the mud like crazy swamp animals.

The first storm did affect the showtimes, as Arctic Monkeys' set at the Music Unlimited Stage was delayed by 30 minutes, and right afterwards, Texan post-rockers Explosions In The Sky had to cut their set short by 15 minutes to make sure that headliners the Foo Fighters started on time. But other than that, it was fun as usual, rain or shine.

It's a good thing that Dave Grohl is just about the coolest rock
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