Fall Out Boy arrived at Washington Square Park in New York City on Monday to film an impromptu jam session – aka a publicity stunt for their new album.
Unfortunately, they didn’t appear to have the appropriate paperwork and were forbidden from playing any instruments, one parkgoer there tells us.
So, lead singer Patrick Stump decided to lead a small crowd along in an acapella rendition of one of their songs.
Bassist Pete Wentz looked so uncomfortable, as if something was seriously bothering him.
Click here to watch him squirm and the really awkward singalong!