I have 3
I cannot juggle. I don't generally lack in hand-eye coordination (not that I'm overly-gifted with it either, but I'd generally say that I'm at least average,) and I understand the theory of it well enough, I've even been able to teach people to juggle successfully, it's just that I, myself, cannot juggle.
I'm also a reasonably handy, technically-minded person, again not an absolute wizard, but if I crack a gadget open, with a couple Google searches and how-to guides, I can usually understand more or less how things work and how to fix them if they're broken.
But something about sewing machines breaks my mind. There's something going on right around the bobbin that just doesn't make sense to my brain and doesn't seem like it should work, but it apparently does, because I've successfully used a sewing machine and can confirm first-hand that they work.
Lastly, I don't like needles. It's not a horrible phobia that sends me running for the hills, but something about needles sleeves me out like nothing else. I can suck it up and get my necessary vaccines and such, but I do kind of have to give myself a little internal pep-talk first. It's not a fear of pain, I have pretty solid pain tolerance and needles really don't hurt that much at all, it's specifically needles that weird me out. If there was an option to get my vaccines where a doctor would shank me with a scalpel and rub the vaccine into the wound, I'd absolutely go for it.