I'm 5ft 10 so can easily spot when they aren't.
I've found this to be the magical age men are most likely to use when they lie about their height. It's like they think saying they are 6 foot is too obvious a lie, but at 5'10 we get all confused and just cannot tell.
I met a 5'10 guy. I'm 5'3 and was wearing flats. He was just above eye level. 
One of the biggest for me was a man who seemed completely normal... we met at a cinema (don't ask) and he turned up dressed like a pirate.
Not even joking. He had a bandana around his head, eyeliner, one of those white puffy shirts unbuttoned to his navel. I was too young and inexperienced to tell him to bolt so sat through the film with him talking loudly and chugging wine from a plastic bag. He told me he was homeless and 'between jobs' but not to worry, his parents were millionaires and he'd be grand the day they died.
The second was again a man who seemed completely normal, professional job, great chat, handsome, no red flags. Then on the first date he said (so as not to waste each other's time
) that I was 'absolutely perfect' for him so would need to give up work (my business), become a housewife (but not to worry, he'd bestow upon me a credit card), and call him by the name of Daddy 24/7. I asked him how that would work with two existing daughters to provide for (and not traumatise with public displays of bdsm) to which he replied he was willing to take them on and they'd get used to it.
I have never blocked and deleted a number so fast. I often wonder if either of them found what they were looking for i.e a cash machine and a permanent sex slave. 