Shouting "LEFT!!!" -------- Immoral Bad Behavior

Per :
A nice, civilized, still audible, "on your left" is a nice touch.

I find a dingle-ding bell works well. Some people even respond with
"Thank you.".

"On your left" works for people who know what it means, but every so
often I would expect somebody to yell back "And so does your momma!"
--
Pete Cresswell