Stupidity

Dude: What’s fourteen plus nine?
Chick, confidently: Twenty-one.
Dude: Damn, you’re fast.
Chick: Haha, you thought you almost had me there!

http://www.overheardatmcgill.com/

Guy: So, what do you do?
Woman: Well, I’m actually a homemaker.
Guy: … Oh! So you’re, like, in construction? That’s cool.

http://www.overheardinminneapolis.com/2007/07/well_the_hours_are_probably_si.html

Overheard by: DRB

Middle school boy: They could solve world hunger if they just kept cloning lots of sheep.
Friend: Aren't sheep like, tofu?

Radnor, Pennsylvania

Dumb blonde: Wait, wasn't Columbus the first president? That's why we have Columbus day!
Professor, calmly: Get out, please.

University of Michigan

Overheard by: getout

Cute young woman, watching tv while studying: Ew, they are kissing so deep! It's gross!
Seemingly gay guy, also studying in the table: Kay*, you don't even know what deep is.

Campinas
Brazil

Greaser guy holding kitten: Who's a kitty? You's a kitty! Who's a kitty? You's a kitty! Who's a kitty? You's a kitty!
Punk girl: I think he knows he's a kitty.

Bakersfield, California

Preppy white boy: You're both women, and you're Asian! How can you have messy handwriting??
Professor: Wait, did I really just hear that?

Indianapolis, Indiana

Overheard by: The non-asian woman

Ditzy 13-year-old brunette: That's so cool! She's French and (whispers) black. I didn't know you could get those!

Woldingham Sacred Heart School
England

Overheard by: on the floor laughing

Ditzy American girl: You're from Scotland?
Scottish girl: Yeah.
Ditzy American girl: So do they have like… Ducks over there?

Orlando, Florida

Buff Asian kid, squinting at label on microscope: Made in… Douche-land? What the fuck is douche-land?

Beverly Hills High School
Beverly Hills, California