It's difficult to pick a favorite here, and Carice van Houten's mid-scene character break will likely elicit a giggle or two, but it's impossible to deny the grace with which Kristofer Hivju, auditioning for the part of Tormund, spews that carrot out of his mouth. Has a part in a major TV series ever been cast without the performer uttering a single word? If not, Hivju could have been the first.
The only thing missing here is Kristian Nairn's audition clip, though you can probably guess why that wasn't included.
Screengrab via Game of Thrones/HBO