Canadian pupils were left open-mouthed when two of their teachers performed a saucy lap dance in front of a packed school gymnasium.

The male teacher was grinding against his seated female colleague while watching pupils giggled. Unfortunately for the teachers, their dirty dancing was recorded on a pupil’s mobile phone and became an internet sensation before being picked up and shown by CBC, Canada’s public broadcaster.

The one-minute clip shows pupils at Churchill High School in Winnipeg gasping as the man appears to bob his head near the female teacher’s crotch and gyrates his bum in her lap.

The two teachers have been suspended pending an investigation after a parent complained to the school’s principal. Some parents have called for them to be dismissed.

No explanation for their behaviour has so far been put forward and suggestions that they were aiming to encourage PE participation are unconfirmed.