Yo, we're TV Fanatic and we're here to say. In the following clip, Rick Castle busts out a rhyme in a major way!

Okay. Sorry. We're done now. It's just hard to resist copying Castle's style, as the author mocks a couple of rapping suspects on Monday's "Lucky Stiff."

Things grow series for Castle as the episode progresses, however. A former friend is the prime target in a murder investigation that pits Castle against Beckett. Check out the sneak peek now:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.