“Someone needs to learn how to lock a door. After her naked shower fight with Sandra Bullock, Chelsea Handler got into a nude-and-crude scuffle with Conan O’Brien.

In the comedic sketch, the late-night hosts trade barbs, then slaps, with each other.

O’Brien starts by accusing her of stealing his old “Tonight Show” space: “This is my studio – you stole it, remember? I still have the key. Plus this is the best water pressure in Los Angeles.”

The video then takes a veiled dig at NBC’s announcement that Jimmy Fallon is taking over for Jay Leno.

If you recall, O’Brien enjoyed a brief stint as “Tonight Show” host.”