Hehe, I scared my dad recently. He's a painter and decorator in a big white van so I shouted 'Bloody van drivers!' as I passed him. He turned round ready to shout before clocking me. He'd given me lots of space but it was worth it for the look of shock.
I've cycled at a fair pace up to an ASL before, just near home (the one in my vid where a Merc driver overtakes pointlessly (and badly) as I'm doing 20+mph and the lights are red)... only to hear a car approaching from behind and then beeping at me.
I was turning around to scowl at them for beeping for no reason... only to see my Wife waving at me. She nearly got a naughty gesture before I clocked who it was!