I fooled everyone the first time, even myself, with how close I was to pushing! The HypnoBirthing made it look like I was in pre-labour, and DP thought I must be right, too, because I was just swaying, rocking and walking, and humming was the only vocalising I did. I reckon if you did some HypnoBirthing you could fool everyone It IS reported to fool midwives and obs, who are convinced they know when someone is ready to pop...
We had planned a FBC birth, but I was still paranoid and didn't want to go 'on the clock' once checked in, so our plan was to labour as much as possible at home. Even when I got in the car I thought it would be much longer, but I was only in the FBC for 45 mins and DS was out, so I reckon, with a bit of self-hypnosis, you could swing a "too late to get in the car and you can't make me"... I told DP soon after DS's birth that he could never make me get in a car again whilst in labour unless it was medically necesary!