By Ian Lendler
Benny and Billy McCrary
Also Known As: those guys on the motorcycles from the Guinness Book of World Records
Famous for: being wildly obese. At 814 lbs. and 784 lbs., respectively, they were the largest twins on earth.
Teamed up: when they were 4 years old, after a bout of German measles destroyed their pituitary glands and caused their massive weight gain. They capitalized on their Guinness recognition in the 1970s by doing a promotional stunt for Honda, in which they rode specially designed motorcycles across America. The iconic photo of the twins was taken during that trip.
Trouble: Plenty, if you were on the receiving end of "The Big Splash" or "The Steamroller." These became their signature moves after they decided to use their fame to form a professional wrestling tag team using the last name McGuire.
The Relationship: ended tragically in 1979, when Billy died performing a motorbike stunt at Niagara Falls. Benny wrestled on, but without his brother, he soon lost interest in showbiz. He retired to a life of evangelical Christian charity golf tournaments before passing away in 2001.
Leo and Ron Gallagher
Also Known As: Gallagher and Gallagher Too
Teamed up: when Ron, the comedian's younger brother, realized they looked so much alike he could perform Gallagher's comedy routine without anyone noticing the difference. He proposed a franchising deal, offering to tour any smaller towns that Gallagher didn't have time to visit. Leo agreed, but only if his brother performed as "Gallagher Too."
Trouble: started almost immediately. The "Too" was dropped from some of Ron's publicity material, and he began performing shows the same night as his brother in neighboring towns. Gallagher asked the neo-Gallagher to stop using his act and, while he was at it, to stop using the family name altogether. Ron refused.
The Relationship: was battled out in court, where the twins' respective lawyers argued over the intellectual property rights of abusing a piece of fruit with a sledgehammer. In 2000, the court ruled in favor of Leo.
This article originally appeared in a 2007 issue of mental_floss magazine.