Thanks, Shan and Laura!
Those dern thangs have been cramping my style since 1981. I almost got to toss one out back then, when it decided to swell up to the size of a tangerine. Turned out it had a bit of vestigial "girl parts" on it! Sadly, the doc was able to save it after cutting away the offending bits. You know, it's funny. I remember at the time secretly wishing I'd needed to have both of them out so I didn't have to be a man.