Because N2O is denser than air.

It's The Day After The Day After Tomorrow.

Did anyone else notice the QR code like pattern on Bernard's computer during the Maeve flashback scene looked kind of like the maze?

I saw this movie in the theater, when I was a kid, as a double feature with The Andromeda Strain. Two great movies. Now that's what I call a Saturday matinee.

A piece of wood could have done a better job playing Sinclair.