I can completely change my penmanship. I alternate between a few different styles, but they can be so completely different that it boggled a tutor a few days ago.
Oh, me too! I can easily and happily go for an indefinite amount of time without talking. I've never had an opportunity to see how long I'm willing to go.I can survive two consecutive days without talking.
Which probably stems from my usualy relucatance to speak.
On the other hand, I am always very enthusiastic about informing people of nauseating facts while they are having meals.