I love the look on Billy's face when he realises that the T-Rex is right next to him.
I have to admit, Billy's demise was kinda stupid. He stood frozen the whole time because he knew the Rex was behind him. Once the canister rolls away, he leaps and runs towards it, dives, recovers the can, and stands up. WTH? During all this time did he FORGET THAT THERE WAS A T-REX BEHIND HIM?! Like in the Lost World movie, at the docks, people jumped straight into the water with the Trex behind them. That would have made sense.