That's right. Real men don't need bicycle bells, either.
We just yell to get "eye contact" from cell phone drivers,
HEY! WATCH IT!
I get much better results from a well-timed shout,
than from hand signals. The immortal thumb is good, sure,
but so is your voice, guys. It needs no batteries, and no pumping, unlike a Zound (tm).
A blinkin' signal is a great idea. I really hope that the item atop this thread gets adopted.
For girls and many guys, a blinking little light is great.
For those who have a free hand when riding, a waving arm remains a great tool.
And if you can anticipate, and imagine that someone is about to turn into your path,
or door you, a shout, if you have a big voice, sure beats a bell or bike horn.
I like to say, when on the bike path, coming up behind walkers or joggers,
"beep beep, coming up from behind, pardon me?" and then repeat that, louder,
if they don't hear me because many people have on headphones. Some are walking dogs,
and so, I try to stay off the bike path here, because it is not really suitable for bicyclists.