Urine in the club.

Some Lollapalooza attendees are facing the music online after they seen “crowdsurfing” an alleged pee bag across the crowd in a leaked video.

“Passing a bag of pee through the crowd is not ok,” Instagram user @edmtrain captioned a clip of the revolting incident, which currently boasts 177,000 views.

The footage, shot during an undisclosed performance at the Chicago-based music festival over the weekend, shows guests passing around a cardboard box filled with a plastic urine sack that looks like something from a hospital bed.

The reason for the literal portable potty is unclear, although it was presumably concocted to avoid…

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