One finger is much smaller than the others
This is because Burghoff, who starred as Radar from season one to season eight of MASH, has Poland syndrome. And no, that doesn’t mean he only speaks Polish.
It means that Burghoff’s fingers (excepting his thumb and pinky) are shorter than the average.
He still manages to hold his cuppa ok
It did Burghoff’s career no harm, mind, what with MASH being the most watched TV show ever made.