Linlin Deng - China - Vault: this Chinese gymnast appears to be constipated - or straining to remain standing.
Kohei Uchimura - Japan - Parallel Bars: again another gymnast appearing to be in pure agony. If gymnastics is so painful I suggest trying Dressage.
Savannah Vinsant - USA - Trampoline: Savannah Vinsant seems to be saying, with this look, that she is just as surprised as the rest of the world that jumping on a trampoline is an Olympic sport.
Maryna Kyiko - Ukraine - Trampoline: I think someone just let a really smelly Olympic-sized fart slip out based on that face.
Tom Daley - Great Britain - Diving: his face says it all, he just KNOWS that he's a second away from receiving an Olympic-sized enema.