From http://twistedmatrix.com/bugs/issue919

msg3469 (view)  	Author: zooko  	Date:
2005-03-12.07:24:14  	

I clicked more than once on the "confirm password" link
in my e-mail.  The 
second, and then again the third time, I got this
traceback:

...KeyError: No such otk
"kM116E41SiddoCjjO5Mbbh6DEYnKWvB1"... (see
http://twistedmatrix.com/bugs/file389/err.html for details)