James Corden And Melissa McCarthy's 'Mouthguard Talk' Will Make Your Day

To be honest, I'm not quite sure WTF I just watched, but I loved every second of it.

Melissa McCarthy and her "The Boss" co-star Kristen Schaal were the latest guests on "The Late Late Show with James Corden."

In honor of their new movie hitting theaters this Friday, the stars had a conversation wearing mouth guards that appear in one of the film's scenes.

These aren't the kind of mouth guards high schoolers wear during sports, though. These are those terrifying dentist mouth guards that make it impossible to talk or use your lips or really do anything.

So, what happens when James Corden forces the actresses to have a conversation with him while wearing them?

INSANITY. That's what happens.

In the video above, watch Melissa, James and Kristen try to drink water, blow bubbles and do a bunch of other absurd things while wearing the scariest mouthpieces known to mankind.

It's pretty scary but hilarious, and it only makes me love Melissa and James more.