Not in, but +1.
My favourite skill in games? Not sure, it depends on what sort of character I'm playing and the game. Favourite spell, on the other hand, is definitely Prestidigitation from dnd. It's a cantrip, so (in pathfinder) it can be cast as many times as necessary throughout the day, and allows you to perform 'minor magic effects', with further detail on the types of effects it can perform on the Wizards of the Coast website. Although it can't directly deal damage, you'd be surprised how many 'powerful magics' used by casters in stories come under that spell. Especially if you have time.
It can do things from summoning some gunpowder and setting light to it from a safe distance to turning the annoying official's hair green for an hour, to getting the dice to roll well to cheat at gambling - and levitate the money to you if you're found out!
I've only played one session of my current campaign, and have already done that last one.