Why is Jennifer Lawrence being so nasty to this interviewer?

In case you haven't noticed, Jennifer Lawrence has quite the sense of humour. She's always up for a good laugh at her own expense. Cue pratfall.

But apparently, she can also do dark and moody, as Ian Andew Hecox from the online comedy duo Smosh found out when JLaw went off on him during an interview.

Of course, it was all part of an elaborate gag that Jen and her Hunger Games co-stars Liam Hemsworth and Josh Hutcherson concocted for Smosh's Ian, who's known for pranking celebs.

Watch it all unfold in the video above. Way to turn the tables on him, #TeamHungerGames.