WHAT THE F IS GOING ON??

Okay ladies, help me figure this out. I just took a shower and while I was rinsing out my hair I felt something slide down my leg. I looked underneath me and it was a HUGE GLOB OF MY HAIR! I'm pissed and Confused. It came out all in one piece! I haven't dyed my hair in quiet a few months now, I use only purple shampoo, my hair hasn't been up for too long, and I don't use regular scrunchies. (I use a clear spiral one that my friend who's a hair dresser gave me because it's better for my hair). Someone, PLEASE, please, PLEASE, help me figure this shit out!!?