Writer's block. That's what they call it.
I'm blocked so bad, I feel like a colonoscopy! (Having one, not being one... metaphorically... or forget it...)
I'm supposed to write a commercial at work - nothing.
I'm trying to write this year's Thanksgiving trip - nothing.
I tried to sign my name - NOTHING!
I'm blocked!... (I'm sure I could conjecture many reasons why... but my folks might read this...)