Watch 5 Seconds Of Summer Sing Your #FallSongs Tweets On 'The Tonight Show'

5 Seconds Of Summer Just Took 'Hashtags' To A Whole New Level

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.

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