I used to have to crack a couple of hundred dozen eggs a day when I worked in a hospital kitchen. You get pretty damned good at it. My kids still sometimes ask me to do the “one egg in each hand” trick at breakfast.
@andrew Who, me? Nope. I just get my thumb in there enough to get some leverage and push the top off. I hold it at a 45 degree-ish angle and don’t end up hitting the yolk, where ever it is in there.