I had a couple of encounters with a brother and a sister that was involved with different types of weight loss schemes.
The "sister" was rather plump and overweight and tried to entice my wife into the scheme ,I tactlessly told her that it didn`t seem to be doing her much good .
And the "brother" who had a beer belly that any drinker would be proud of as having your own private keg wore a T-shirt that said "Lose weight ? Ask me how"
That was a great source of amusement for me.
Their was also a couple ex missionaries who ran a hair removal salon using electrolysis ,what a scam that was that many witnesses fell for.