08/06/2012 04:56 pm ET

Kristen Bell & Dax Shepard Get Intimacy Lessons From Tom Arnold On The Set Of 'Hit & Run' (VIDEO)

Real-life couple Kristen Bell and Dax Shepard ran into some difficulties while filming their new movie, "Hit & Run" (and no, that's not the name of the new Amanda Bynes biopic).

A behind-the-scenes sketch made by Funny Or Die shows that although they are engaged, Bell and Shepard have a hard time getting intimate when crew members are ogling them on-set. Naturally, co-star Tom Arnold is the only person who can come to their aid.

Because when we think on-screen chemistry, we think Tom Arnold.

Watch how the "Roseanne" star helps Dax and Kristen find their groove in the video above, and see below for some more of our favorite comedy couples.


Our Favorite Funny Couples