Should I use "the John" or "the john" when referring to the slang phrase for toilet?
Should I capitalize the "j" in John when referring to a toilet as "the john." The same goes for lazy Susan and other words that are also names.
Solution 1:
Since the john is not a proper noun, lower case is more useful for clarity. This way, you could avoid ambiguity in situations like...
When John arrived at work, he headed straight for the john.