Wild and Crazy Starter

Hello all,

Long time reader, first time poster.  Recently moved because of the job and forgot my starter.  I was in tears but there wasn't much I could do so I set up the new one last night and to my amazement it did something I never expected it to do, it went crazy!  I've never seen one develop so fast.  Is that normal?

Here is a picture of my pet:

All it is, is 1c. UB bread flour and 1c. h20.  I just fed it and already it's expanded and bubbly.  Could something else have gotten in there or did I just get lucky?  Haven't noticed any off smells or colors.

Advice is welcomed,

Justin