If we run into anybody who can do that, gravity will be the least of our worries. Reminds me of a city council meeting I attended one time in Seal Beach, California. They were considering an ordinance that would prohibit various sorts of conjuring, including "materializing and/or dematerializing objects, and telekenesis." Some guy stood up and said that if they run into anybody doing that, he would advise against messing with them.
Lol good sugestion