Okay, now we're talking. Usage and grammatical errors are interesting when the confusions they engender are funny.
Here's my favorite street-sign error, based on unclear pronoun reference:
"Prepare to stop when flashing."
I'd just like to say that on principle, I refuse to stop. I have never flashed, I am not flashing when I read the sign, and I never intend to nor am I capable of flashing. So there.