I've seen kids cry before. I have not seen them take off their shoes. They are allowed to stand tall, but I've seen them remind the kids to keep their heels down on the ground. It is always exciting to see someone pass.
When ds turned 4 and less than an inch shy to ride, he pitched a fit to ride TOT, ..."Okay" I said and marched him right up to the cm who measured him and said "sorry, buddy, Maybe next time!" I was very thankful, because they make the rules for a reason. (also, he did not get a certificate, like a previous poster thought they handed out...that would have been special)
I know it is disappointing to not be able to ride something when you have your heart set on it, especially when you are young and do not fully understand. No one wants to see their little one cry or feel disappointed. Imagine the horrow, though, if something went wrong with someone too little to ride? As parents, we can't imagine this. That is why Disney has imagineers, lawyers and insurance underwriters do the thinking for us and they have their cm's enforcing their decisions. It is really for our own good and Disney's.
Adding...
OMG I just remembered (I am such a bad mother) at 4yo ds WAS tall enough to ride TOT, but I told him he wasn't because I knew he couldn't take it....I am so mean! (maybe he could take the ride itself, but not the suspense building up to the ride...the back story....his imagination was and is way too vivid for his own good and he would have only ran away screaming!!!) Space Mountain was where he was "so close, but no cigar"!! That's where I had the CM check him and he didn't pass. Later when we went over to MGM (HS), I told him it was the same height requirement as Space Mountain... To this day he doesn't know I did that to him!!! OOOps, mommy blocked out a lie (maybe I feel guilty about that!)
He pitched a fit to ride so many things that trip, so it took a few moments for me to remember which ride I let him "test" for!!
By the way, he would not ride Splash Mountain, which he was tall enough to ride!!! He was afraid of the giant briars in the briar patch. From a 4 year old's perspective it looked like the people in the log might actually get caught by the briars and he was having none of that!!!!!!!! Man, I almost pitched a fit trying to talk him into that one..oh well!