Story, not mine, someone close to me for many years:
Buddy calls: Help!.
What?
Buddy: I was watching the bid list on a bunch of projects on a gov site and I just got the contract to supply a bunch of signs.
Um, ok, what's the problem?
Buddy: I realized they weren't really signs, they are targets, and the printed dimensions don't match any of the equipment that exists. Every piece is a one-off and will cost me 10 times to make them over what I bid! And if I don't fulfill they will sue the hell out of me.
Oh well.
I wonder how many contractors went through that type of process before before realizing they were supposed to all bid very high.