Nothing serious only funny.
I had gone to the doctor the day before or day of and they took blood.
So, I was training biceps/and triceps. I noticed this purple spot on my bicep right where they took blood, and it kept getting bigger and pooling around that area. I got nervous, and stopped doing biceps. So, I went and continued doing triceps. My last exercise was close grip bench press with 40 on each side, this was my 4 exercise out of 5. And I was exhausted, and I was the only one in the gym, I hit failure, and I tried to rack it on a lower notch and missed, and it came down on my chest and the weight went to one side and slide off.
Now, this was in the presence of cameras, so I bet I gave the owner a good laugh. After 15 minutes I went straight to the dip bar.
I went home with a bicep with a growing purple mark, and a new appreciation for the term "going to failure".