No pain no gain?

What the hell happened last Monday? I had a leg day and pushed up 200kg (+ the weight of the leg press) six times. I did 5 or 6 sets on that leg press (all together) but my legs were fine All week!
Did it really happen? Maybe I have a mental strength that did the pushing?? I got it on video.
Haaa! I need to use more weight!?! ;)