Billie Joe Armstrong has found quite a few ways to keep himself busy whilst sheltering in place. He has crreated a music experience called, 'No Fun Mondays,' where he's recording a cover every single Monday until this is all over and he took some time to hang out with Jimmy Fallon on his late night show (via his house...lol). You can check out Billie smashing his cover of Tiffany's (originally Tommy James') cover of 'I Think We're Alone Now' below: