Matt, This Week’s Science Blog is for you, ‘cause I know you really dig Portal.
Here on the Steam forums is a list of Portal physics answers (warning: not devoid of childish internet arguing and name-calling).
I like the crushing one (the second scenario). This stuff makes me want to play around with Garry’s Mod.
Speaking of Garry’s Mod…
Just a little tidbit of the internet to lighten your day. My day’s pretty much sucked, at least, so I hope yours is going better.