on the super rare occasion that I actually am going to pass someone, and manage to remember to say it, and say it loud enough to be of any good... I get the direction wrong (I'm REALLY bad with L/R confusion, turns out there's something about L/R brain connection that makes people more likely to have difficulty remembering the two - yes, I'm totally gonna cling to that). (and no, they both look like frigging L's to me, and no, I write with both hands - the wedding ring has helped recently, and the lack of toilet paper helped in Mali, but it's still an issue)
Not like I'm doing it all the time, but I do hate that moment of "ohcrapwhichdirectionisthisineedtoshoutsomethingjustpickoneok..." and then they shout the other one after me, to correct me.
So for those of us too confused to really be permitted to ride a bike in public, what should we shout? "Behind you?" "Watch?" (too short I think) "Passing?" "Excuse me?" Is there something that is more helpful than startling but does not contain R/L?