I do stupid stuff like that myself. 2 weeks ago I was doing trap bar deadlifts, and I went down too fast and pulled a muscle (left spinal erector). Of course I was at rep 3, doing sets of 5. Since I am in "crazy mode" (I lack commen sense to stop when i should, because I put all my focus on completing my set, or in other cases a sprint). I continued for 2 more reps. Then I my brain returned to my head, and I realized I was done, and went to reracking the plates - which sucked balls with a hurting back.
4 days later I am doing step ups with 100lb dumbells, not exactly easy on the back, but I was okay. The back slowly got better each day. And so last week I ended up doing deadlift triples with a weight 20lbs more than my previous max. My lucky ass escaped more injury.
2 days ago I got some tendonitis in my bad knee. today I felt good again, so what do I do? ATG squats with a weight 35lbs more than I did previously. genuis move, but once again I avoided injury.
The lesson? You don't have my luck, so take it easy when coming back from an injury.
I suppose I just like to test myself a lot, see if I am healed up. I have a hard time holding myself back from training.