I heard about a scientist who constantly cracked the knuckles on his left hand every day for thirty years to see if there was any more risk of arthritis than on the other hand that he didn’t crack the knuckles on.
Both of his hands felt the same, but his fellow scientists felt like he was going to beat the crap out of them.
“Sure, his research is in arthritis and how cracking his knuckles would affect its progression,” they said. “But does he have to always have a menacing leer on his face as he walks around the lab?”