self-importance. the size alone equals, i'm so important i don't need to obey margins. i can just scribble like i'm a movie star or a rock star. >> reporter: or a president, or a best-selling author. trump supporters dug up j.k. rowling's signature, i guess you're no different then. >> it is funny. she is throwing stones about donald trump, but she also has a really big signature, which i think is a success trait. >> reporter: that goes for both of them, but gra-- while presid trump's signature looks like a hacksaw. >> his sharp, angular, scissor like ms and ns, basically a lack of compassion. >> it looks like the result from a polygraph. he's laying, of course. a polygraph, a sithe -- perhaps trumpian. >> it's really the epet my of