71C Outbound, Oakland.
The bus is packed, and a Black Chick sits in an aisle seat next to a pile of crumbled Saltines™:

Older White Dude: Mind if I sit there?
Black Chick: It’s all dirty.
Older White Dude: It’s just crackers; you can brush it off.
Black Chick: [gives shoots a dirty look.]
Older White Dude: [politely snide] Oh, I don’t want to do anything that would offend you.
Black Chick: [re-assuringly] I’m going to be getting off soon.

Black Chick gets off.

Older White Dude: [brushes Saltine crumbs off and sits down.] What a brat.

— Overheard by Sophie