So it turns out when she's not busy filming epic blockbusters like Suicide Squad, Margot Robbie takes on some pretty adventurous hobbies. 

As she told Stephen Colbert while herself and Tina Fey were on to promote new comedy Whiskey Tango Foxtrot, she likes to go skydiving and also recently bought a tattoo gun. She's an amateur tattoo artist. 

It all started out pretty well as she gave tattoos to friends who asked for them, but of course something had to go wrong eventually. We'll let Margot pick it up from here. 

As Tina Fey quips, "A good time to be pretty."

We're sure the unfortunate cast assistant didn't mind too much. A free tattoo from Harley Quinn is still pretty cool even if it is spelled wrong.