We got Halloween problems but a witch ain't one.
Since fall is officially underway, Jimmy Fallon sent out a #FallSongs hashtag to get back some seasonally-themed tweet parodies of popular songs. If that wasn't awesome enough, he also had musical guest 5 Seconds of Summer sing some of the best ones.
"The Tonight Show Starring Jimmy Fallon" airs weeknights at 11:35 p.m. ET on NBC.