This shirt was specifically made with the cryptid tumblr fandom in mind. Here's the description:
"Mothman was winged man-like creature that was sighted around Point Pleasant, West Virginia from 1966 to 1967. Some believe it to have some correlation with the collapse of the Silver Bridge in 1967. Some say it was trying to warn people of the disaster while other people say it was the cause.
Today some cryptid enthusiasts draw Mothman as an endearing little puffball.