Tackling a referee is not advised - two-footed tackling a referee is also not advised.
But RKC Waalwijk's Jeff Stans just couldn't help himself against NEC earlier this week - in fact he slipped, but lets pretend he didn't.
The Dutchman chopped down the ref in classic comedy style, attacking his blindside with all the cunning of a defensive end in American football.
The referee hits the deck - cue apologies and a little chuckle from the Eredivise official. It's all in good spirit. A harmless incident, but a funny one nonetheless.
Watch the referee get two footed by the RKC Waalwijk player in the video above...