You’re probably right. But either would work, maybe more so of my example because you’re pointing to the ‘coin’ while asking them to name it. In their head, they’re thinking the coins name must be ‘quarter’. I don’t know, I give up.
Bob’s Mom’s third child is named “Bob”.
If I flip a coin 10 times, and each time it comes up heads, what are the odds that that just happened?
Dogs, canaries were named after the islands.
I don’t know what others said but “gry” itself is a word as is “aggry”. So that means that there are at least four. After “hungry” and “angry” most people get stumped.
Cheerleading, right? Fifteen or so?
Some of these are just trivia qs, not ones to which the answer is intrinsically counter-intuitive, which is what I think the OP was after.
One for my fellow Brits: approximately how many kings have been crowned in England since the Norman Conquest?
The British.
Tripler
I’m still working on my trick question.
This site (only the cache seems to be available) has a lot of theories. They prefer the one that says the creek was named after an Indian named Buffalo.
Yup, including 8 in a row (a streak broken in 2003, or else the count would be 10.)
What’s in water that puts out fires?
Cheerleading is a sport? 
I’m not sure whether this is supposed to be a trick question or not, but I’ll say approximately 35.
No moreso than playing video games is a sport.
By appearance. It’s not Namor. Namor was not a mutant until Magneto met him and they retconned him in. Who is the first mutant to appear in Marvel comics?
Who was the first mutant to appear in comics?
And don’t forget, who invented the hydroplane?
“Who invented the hydroplane? Some Macedonian teenager coming down out of the hills racing his chariot on a rain-slick dirt road.” 
I dunno, horses don’t hydroplane so well. Fine, the aileron. That’s the flaps on the wings of airplanes.
It is a sorta trick question, and 35 isn’t the answer. It isn’t even close. I’ll not post the ‘correct’ answer just yet, in case anyone else wants to have a stab.
I’m not British, and I suck at history, but being that this IS a trick question thread… WAS there a Norman Conquest? I’ve heard Norman Invasion, but I don’t think I’ve heard “conquest.”
I hope it’s not some silly argument that since the question asked how many kings have been crowned, rather than how many men have been crowned king there’s only been one - James I, who at the time of his coronation as King of England had already been crowned as King James VI of Scotland. In fact it might be two by that interpretation, since I think Charles II may also have been crowned separately in Scotland too. If that’s the argument, I don’t think it holds any water.