What happens when you ask two TV actors to sing a duet - on the fly LIVE - that has nothing to do with their TV series?
If you're a fan of musical theatre, this will makes you laugh. We've all done this in our living rooms at some point...
Neil Patrick Harris and Jason Segel of How I Met Your Mother Sing "Confrontation" from Les Miserables (Inside the Actors Studio (2014)
Apparently, Neil and Jason sing this together onset as an ongoing joke. I think the first time they did it on TV was 8 years ago on the now-defunct Megan Mullally Show.