Sniper doesn't understand

Sniper doesn't seem to understand why everyone's looking at him funny.

I- I think it's a baby pyro about to light sniper's hat on fire with a cigarette lighter. Sniper is unaware, so Demoman tries to warn him.

Baby pyro attempts to set Sniper's hat on fire, as Demoman tries to alert the aussie of this. I don't think he gives a damn though.

Pyro Sniper and Demoman (?) as little kids at the same elementary school as the Power Puff Girls.

Party fortress?

BLU team having a party (one of them is a spy!)

Entire team give heavy cake for birthday. Mmm.

Birthday cake tastes awful so everyone gives Heavy their piece. Heavy doesn't mind, he is the Birthday Boy after all.