Katy Perry and Rebecca Black on a Friday

It's not exactly a duet but this mash-up combines Rebecca Black's "Friday" and Katy Perry's "Last Friday Night" into "T.G.I.Friday!" Give it a listen:

T.G.I.Friday (Rebecca Black vs. Katy Perry) by TheJaneDoze

We wonder. What other songs could possibly be mashed up with "Friday?" Got any ideas?

(via Teen.com)