Public transportation

Pilot over loudspeaker (riffing on harmonica): This is your captain speaking, (harmonica riff) Welcome aboard, (harmonica riff) Please fasten your seat belts. (harmonica riff) Or we won't be able to leave beautiful Atlanta, Georgia.
(does long, jazzy harmonica riff. Passengers applaud)
Pilot (in Elvis voice): Thank you very much.

American Airlines Flight
Atlanta, Georgia

Girl on train: I usually do my arms, but then I look at Jane and her hairy arms and think, Man, if she can do it, I can, too!

http://overheardinsydney.blogspot.com/2006/02/when-in-rome-do-as-romans-do.html

Man: My nipples are exploding with excitement!

Back Bay Station
Boston, Massachusetts

Overheard by: Me too

Flight attendant: Okay, everyone, we're going to be landing soon. We would like to be the first to welcome you to reality…I mean, Cleveland.

Plane over Cleveland, Ohio

Confused lady on PA: Ladies and gentleman, flight 250… Wait, where am I?

Airport
Salt Lake City, Utah

(strange loud sound comes from the plane)
Calm but confused flight attendant: That's weird, I've never heard that before.
Freaked out passenger: Um, excuse me? What?!

Flight to Cancun, Mexico

Flight attendant (on PA): Chances are they're all middle seats. Find the one with the most attractive people, and take it.

Southwest Flight over California

Overheard by: Armen

Angry mother on the bus: Come here and sit down!
Four-year-old: No, it’s okay. I’m being good.
Angry mother: This bus is going to stop suddenly and you’re going to fall down and crack your head open on one of the bars, and before the bus gets back around to the hospital you will bleed to death!

Pullman, Washington

Overheard by: jeff

Teen boy #1: Haha, you have to be in the back of the bus.
Teen boy #2: Is that a race thing?
Teen boy #1: No, its a sexual thing.

Chestnut Hill, Massachusetts

Overheard by: Sara

Woman on phone: Man, you know what open flesh smells like!

BART Station
Pittsburg, California

Overheard by: Hannah