The kind I've never caught before. And since I am relatively new at this, that has happened with every recent catch in the salt. Jacks are fun because they fight, and if you are in a kayak, they will actually tow you. I have caught a bunch of them, and still welcome it every time. But the last four fish I have caught were each my first of that species (snook, baby tarpon, black drum, and redfish)... and three of those were on the same day... so it has been a blast!... what fish in your experience induces the best adrenaline rush.