Not so long ago a friend of mine was attempting to lose so he could lay off on Betfair and make, admittedly small, but accumulative gains.
Sods law, nearly everything he backed won. Outsiders with no form whatsoever beating odds-on shots; backing the draw in football matches only for the underdog to equalise with the last kick of the ball, etc, etc.
You couldn’t make this stuff up but it happened. An unbelievable run of freak results which saw his various bookmaker accounts either restricted to ridiculously small amounts or closed entirely!