No offensive words either! We don't want our engineers looking through our big plaintext files to get offended.
One time I gave feedback to Google, from a Google feedback form, and gave my real (and had been in use for years) googlemail account name on this Google form.
The form rejected it, because my real name has a mild swear in it.
That kind of thing is vaguely disappointing.
I did suddenly have to change all the answers to my 'secret questions' when I realised that I'd have to read them out loud if I needed to get back into my bank account. Lots of profanity snipped there.