What's worse than filming a sex scene with nothing covering your parts but a piece of celery? Discovering midway through filming that your mother's come to visit the set that day. This story, plus a vintage Late Show clip inside.

When Dave mentions that the film's got a lot of nudity in it, Forte feels the need to let us know the difference between a regular reaction to a nude scene in a movie and the reaction he expects to get from MacGruber's sex scenes.

Here, he chronicles the tale of his mother showing up on set with her friends while he was in a very compromising position.

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Bonus! Will Forte spent two years working at The Late Show and Dave dug up an old clip from his time there.