What would your reaction be?

The normal reaction would be to ignore them!

'Flashing' is not a normal reaction, its a provocation for a lot of hassle, both for you and your female friends, it could be construed as a sexual invitation !

It's happened now and all over but bear it in mind , there are a lot of complete nutters out there!! Don't allow it to happen again!

I'd think he's insecure for not stopping and telling you in person to your face. And I'd think he's inconsiderate if he blasts his horn shouting late at night not caring if he wakes neighbors. My first reaction would be "how immature". For a teenager: "Oh my god like, how cool!"

why would any one want to drive by and yelling i love you unless he is drunk, or just a rowdies and show offs. i would not waste any more thought on that. as for flashing your inviting trouble, not only by the cops but , may be a hand full of guys in that car would drive right back and demand more than just flashing

If more women would simply flash an idiot than respond in any other way all men would be idiots.

love is something that you cant catch out of a car window, or throw out of a car, dont react. let it go by like water off a ducks back.

Probably report them for drink driving!

Careful with that flashing, you could be charged with a sex crime and be on the sex offenders registry.

I'd think poor deluded man even if I did know him

Just smile

It's amusing but I think IRL it would be nothing but trouble.