Common Cold on Harry Potter's Rap Skills

10/31/2014 6:00 PM PDT
TMZ TV


Common caught some of Daniel Radcliffe rapping on 'Jimmy Fallon' the other night ... and gave us his honest review. But that wasn't enough to distract some people from something else -- Common's severe lack-of-Serena-ness.

Yes, sometimes break-ups (even ancient ones) can be really hard on total strangers.