I think this is going round and round on the Interwebz, but I thought it was too nice to share it here too!
I am fond of the “clap them” and “look confused” strategy, tried and tested… not sure about the “flash them”… 
Thanks to all who contributed on the mini discussion in my last post. Really appreciated hearing/reading people’s opinion and experience. Let’s hope there’s more of us out there on the road, who see each other as just cyclists, than those who get a kick out of creating friction
Image found via Girl On Bike. Image source Urban Velo.
I have been known to ‘blow them a kiss’.
I’ve been known to ask if they need a hug, then waving excessively, as if sending off an old friend on a long journey.
I always wave at them. It’s funny to see the confusion on their faces
Sometimes they wave at me as if they had recognized me. Silly.
I am liking the “blowing a kiss”… I may try that! And if I have the chance to catch up with said yeller I may ask if she/he needs a hug, although I am not sure how Mancunian people will take that. I have waved in the past but on rare occasions I got the middle finger back
classy, I know…
I take out my jerk book and pretend to write their license plates. It scares the great majority.
What a fantastic idea
I can imagine being rather effective!
I like the “get a song stuck in their head” option. I’m thinking something along the lines of: “it’s Friday, Friday . . . . . fun fun fun fun.”