It's no secret that filming Game Of Thrones is an excruciatingly long, expensive endeavor.
And for the cast members who aren't playing main characters like Daenerys, Tyrion, or Jon Snow, shooting the HBO fantasy hit includes a lot of down time.
So, what do minor characters do to kill the time while Lena Headey films one of her many sinister monologues about murderous betrayal? They play Ellen DeGeneres's iPhone app Heads Up, obviously!
Related: GoT Teases Season 7 With Descriptions Of New Characters!
Eugene Simon, who plays Lancel Lannister, posted a video to Instagram, showing the supporting cast playing a heated round of the hit guessing game while on the King's Landing set of the hit series.
Simon is joined by Tommen Baratheon (Dean-Charles Chapman), the High Sparrow (Jonathan Price), and even the "shame!" nun (Hannah Waddingham) — who all play along in full wardrobe! Watch out for the wildfire, guys…
Ch-ch-check out the clip (below) to watch the behind the scenes fun!