I'm going to say that this happened on a "track".....I came around the hairpin and put the boot in, one wheel spun and lost traction, then as I was straightening up the opposite wheel spun too, causing both wheel to spin at the same time. (could tell from the 2 Tire marks left behind)

I've never had this happen before, and i know for sure that its only got a one pegger. So technically how could this have happened?

transfer of weight,diff may be on its way out. Many explanations,but relax-you still got a single spinner.

I was just thinking it from a dangerous point of view. Not knowing when it could happen again

Yeah, round-a-bouts can have that effect, as mentioned its weight shift while the car is already bagging up, it will happen, it will not happen consistently. So your guess is as good as everyone elses as to when it may happen again..