As a Premier League referee, you can't do anything right. And when you do make a good decision, it's either a bit of good fortune, or some piece of technology has helped you out.
So the last thing you want to do is draw attention to yourself or ask for even more abuse from the fans with a new accessory, flashy boots... or even a dodgy haircut.
Introducing Michael Oliver ladies and gentleman.
His 'missus' may like it, but for a professional law enforcer in the biggest league in the world, he may think twice in the future before getting the ol' clippers out again following the abuse he has received on Twitter after being spotted on TV with some suspicious looking tramlines that even a nine-year-old would think twice about...
Michael Oliver clearly wasn't feeling well when he went to the barbers this week #LeicesterVsManCity #PremierLeague pic.twitter.com/ZHGVBQeSFb
Michael Oliver deserves sacking for that
Don't know what's funnier... John Stones defending or Michael Oliver's hair. 
Michael Oliver thinking he's Paul Pogba... pic.twitter.com/qn5Vox68Rx
Don't let this City collapse distract you from the real horrorshow in this game.
What the f*ck is Michael Oliver playing at?  pic.twitter.com/WsRA0K3jwD
When you gotta ref a game at 5.30 but got beef with a south london roadman at 9 #leimci #michaeloliver pic.twitter.com/s7FBWIQ8i1
Poor Michael. Even with a diabolical display from title hopefuls City, two lines on the head ofa 31-year-old man from Northumberland put out a better performance.
Lesson learned. It's just a warning this time, but once more and you're off.