Period- blood clot

[switch-fluffles.livejournal.com]

This morning I woke up and went to the toilet and took out my tampon and then urinated, then suddenly I heard a 'plop' sound and I looked into the toilet (because I felt nothing leave my body) and there was a blood clot the size of a bouncy ball with the diameter of 1 1/2 inches. I have been getting my period for 8 years now and I have never experienced a clot that big, it was gross. It never seperated in the toilet either it was just like this ball of blood (it sank). Has anyone ever experienced a clot that big with their period? Is it normal? im not worried it was just kinda weird.