Sometimes they do the opposite - see you coming and snap their mirrors in quickly!
The weirdest one I've had was one roll down the window and scream at me, causing me to perform a wobbly emergency stop. It transpired that they were upset that I'd broken their mirror. Pointing out that:
a) I wasn't anywhere near their mirror when they shouted
b) I wouldn't have wobbled if they hadn't scared me by shouting
c) In spite of that, at no time did me or any part of my bike touch their vehicle
...and most impressively:
d) the mirror wasn't even broken
...didn't get me anywhere. Eventually I gave up and rode off, before it got any nastier.
That's put me off filtering, generally.