Nuff Sed
No, it's not illegal to yell something like that. If it's in the USA, you have a nearly absolute right to say what you want, even if someone overly sensitive or self-conscious might find it insulting or even racist. Others may find it hilarious, or idiotic, but what you do you care?
Michael
That happened to me once. Someone in a car yelled "run Forest run" as I was jogging and then pulled into a Burger King. They were getting out of the car as I jogged by. They were fat. I yelled "Step up to the trough big boy" as I jogged by. Fat people are disgusting.
Susie
It is showing disrespect to “Forests” which obviously can’t run. Plants have feelings too. Hey this isn’t any more ridiculous than the things the liberal PC crowd comes up with and they’re serious.
Anonymous
Because of comedy sketch I saw once, every time I see a flower delivery person run or trot up to a door with flowers, I holler at them, "RUN, FLORIST! RUN!
The Truthseeker
It could be construed as making fun of the disabled.