Douglas B set the cat amongst the pigeons when they beat Shimmin Wilson Manx Shield leaders Southern Nomads 20-7 at Port-e-Chee.
New dad Niall Killey picked up two tries for Douglas and there were also tries from Mike Hebden and Liam Murphy.
All Nomads’ points came from Dave Caldwell, courtesy of a try and conversion.
Douglas now move into second place with a game in hand.
Ramsey B’s hopes of capitalising on a Nomads mistake were dashed when they crashed to a 58-3 defeat away at Vagabonds B.
Sam Liver was the star for Vagas with a hat-trick and there were also tries from Pete Faragher, Rob Martin, Ryan Pope, Joe Louw, Floris Venter, Ben Sharples and Jack Lemon.
Jonny Beckley added four conversions.
FC Isle of Man returning to league action at Barnoldswick Town
New padel courts in Noble's Park opening after two years in development
Hockey: Compact mixed schedule on the cards this weekend
Rugby: Busy triple-header beckons at Ballafletcher