I recently had out a RFP for some construction work. One guy called me and told me to call him back when I've got some offers, he'd knock 10% off the lowest one

I recently had out a RFP for some construction work. One guy called me and told me to call him back when I've got some offers, he'd knock 10% off the lowest one. Needless to say, I said thanks, hung up, laughed and crossed his name off the list of candidates.