I got the very annoying warning below after fighting to submit a question and having it refused for unintentionally trying to add new tags.
Should post this warning during the 20 minute period starting from the first question that started the clock, not after s/he's worked 5 minutes writing the question and has to save it in Notepad for later or tomorrow
In the message, link the words "new user" to a definition of "new user"
Oops! Your question couldn't be submitted because: new users can only post questions every 20 minutes; try again later.