Oh Lord yes. And I'm 28, so it wasn't even that long ago so I have no excuse.
My hair is naturally dark brown. At 16, I had the most hideous blonde highlights you can imagine. They were very cheap.
At 18, I had a free haircut at Vidal Sassoon. I let the guy go wild, and he dyed my hair black, cut it into a bowl and left one long part at the side which he permed, bleached and dyed red. It was like a prawn hanging out of an upturned dog's bowl.
At art school, I just chopped bits out of my own hair and it looked awful. I used to put Spray Mount in it to make it spikey. My tutor used to go mental if she saw me smoking when I'd just been freshly Spray Mounted. She thought I'd go on fire.
A bit later, I decided to bleach my own hair. It looked awful, so I put a hat over it, went to Morrison's and bought some dark brown dye, which came out the fakest black you will ever see.
Not long after, I thought I'd give myself a home perm. It didn't really work, and I ended up with string little black coils, looking like Peter Andre in 1996.
Since those days, my hair has not had a drop of dye put through it. It's long, brown, curly as nature intended. I would never mess with it again.