Don't worry about it, a few year ago, I had to go on a board of inquiry, so the night before I got my partner to cut my hair, a number 3, as she was cutting the top I thought I saw something go flying across the room but was unsure. Looking in the wall unit I saw by the reflection that my partner was looking down the street and not paying attention so I became a bit concerned and questioned her if the guard was still on. Sure enough the guard had come off and I was bald down the top, a reverse Mohican. All she could do was give me a Number 1 to try and hide the bald patch.
At the inquiry, it was obvious that the interviewer kept looking at the top of my head as I looked a right dork. In the end I explained what had happened and fortunetly it broke the ice of the hearing so it became more light hearted thankfully.
Then there was the time my Ex cut my hair, I knew something was wrong as she kept snipping away in front of my left ear area. When I looked in the mirror all my hair was gone from that area and I looked like a right pillock. She new she had balls'ed up but kept cutting more off to try and make it look better which did not work.
When I got the lads on parade, I took my beret off to show them and warned them to laugh now, otherwise I would fill them in if I caught them laughing later. What a pratt I looked.