You and your good friend Sally are catching bart to SF, and notice a strange man staring at you. You notice Sally looks uncomfortable but the strange man stares on.
The strange man ventures a wave and "hello"-- Sally mumbles a flat "hi" and short wave, before you both board the train-- the strange man in pursuit.
The strange man sits next to Sally, despite plenty of other seats being open. He spreads his legs to take up space. Sally is looking away from him. He places his hand on her thigh and leans over to whisper in her ear: you're a pretty woman"