You never know what you're gonna get

Or hit by someone illegally changing lanes while you legally ride between them because it is legal to lanesplit in some places

This particular motorcyclist seemed to be lanesplitting responsibly. They were going slowly enough to have an escape plan for whatever happened.

The driver on the right has some great nonverbal communication. Without saying any words, she requests the motorcyclist hand her the cigarette and then very politely thanks both of them and gets out of the way.