When Lady Gaga goes home at the end of a long day, she likes to kick back, curl up on the couch, and relax to the soothing image... of a human head being liberated from its body by a chainsaw.

Ahhhhh, zen.

Gaga was on "The Tonight Show" Tuesday (Oct. 6) in advance of her "American Horror Story" debut -- and we're not sure if she's always been like this, or if her starring role in Ryan Murphy's anthology frightfest has caused some fundamental changes to her idea of a good time, but this girl really loves herself some scary s--t.

Check out her interview below, and tune in tonight (Oct. 7) to see her make a (bloody) splash on "American Horror Story: Hotel."