My best Roskilde experience was in 2003 (I think so anyway...I'm not really sure, but it doesn't matter).
I was kinda bummed one night...me and my girlfriend had just broken up a month before Roskilde, and I had been pretty busy comforting myself with all kinds of girls, so I had made a promise to myself, that I wouldn't pick up any girls on the festival that year. I couldn't stand myself, using all these girls just because I felt bad.
I had lots of fun on the Festival, because I didn't have to think about scoring with the ladies, but I was still a bit sad because I missed my ex.
One of the first days I smoked waaaay to much funny tobacco and went to sleep for 4 hours. I woke up at midnight well rested, while everyone else in my camp was getting ready to go to sleep. "Boring bastards", I thought to myself and packed my pants, hoodie and jacket with beer bottles..."I'm going out to find a party!!".
Armed with 14 beers (biiiig pockets in my jacket) and the right attitude, I was on my way.
I was completely awake and sober, which is a rare occasion at midnight as you might already know, so walking around in the camping area was quite an experience. People were partying hard and I had no trouble finding fun people to join.
After running around for 4 hours talking to strangers about everything and nothing, I'm on my way home to the camp. 20 meters from the camp I find 15 people sitting on a paved road near the entrance on Easy, playing guitar and having fun.
I was a pretty amateurish guitarist back then (and maybe too aware of it), but I joined them hoping to get to play a song or two. They were incredible people, sweet and funny, and their guitarist spotted me looking at him playing, so he asked if I wanted to play.
I ended up playing for 2½ hours straight, while people were singing and partying. Others joined us and suddenly there were 25 people.
Considering my lack of confidence in my guitar playing skills, it was an enormous ego boost, that I could entertain a group of complete strangers, bringing everyone together to sing the songs, that I played.
Some of the girls in the group were sending me the "you can sleep in MY tent tonight"-eyes, but I stayed true to my promise to myself.
To top it all off...in the middle of playing a song, I was tapped on the shoulder and I looked back while still playing. Behind me stood two girls dancing, and when they saw me looking at them, they both shouted: "YOU ROCK!! YOU F*CKING ROCK!!" and danced even harder.
That was the first night in a month I had true fun without any of the other shit creeping up in my mind. And this is what Roskilde is all about Making you forget about all your worries and just enjoying the moment that is right now.