Though I automatically use $foo (and $bar next), when I need a couple more I tend to use $fee, $fie, $foe, $fum. I have no idea why - maybe it comes from having kids?

Update: I was browsing the jargon file on foo and thought others might enjoy this bit which fits well with our metaphor:

An old-time member reports that in the 1959 "Dictionary of the TMRC Language", compiled at {TMRC} there was an entry that went something like this:

FOO: The first syllable of the sacred chant phrase "FOO MANE PADME HUM." Our first obligation is to keep the foo counters turning.

--
I'd like to be able to assign to an luser