Don't worry, they'll tell you.
If the shutter makes a "crick" noise.
I don't know nobody has ever made it across.
An extroverted physicist looks at shoes when they're talking to you.
They're the ones who look at YOUR shoes when they talk to you.
He leaves a dark mark
A nun with a javelin in her throat. (The only joke I can ever recall when asked for one. Told to me by my art teacher in Grade 11. Needless to say, he was my favourite teacher)
To get to the other side.
Pilot: Well I'm 6 foot tall and I'm sitting front left.
Don't worry, they'll let you know.