I didn't see it at all, even when it was pointed out.  Then it kicked in after much staring and wondering why I am missing it.  
It is like the contraversy in which one scene in The Lion King, people claimed to see a dust cloud form the word SEX, which outraged many parents.  Despite knowing where the supposedly offense scene was and looking for it over and over - it is just a dust cloud.... to me.
The power of suggestion....
Edit:  Changed reference to avoid religion imagery in coffee stains which might cross forum rules.