Here is the only linguistic joke I know:
Q: What word is photi?
PH like elephant, “o” as in . . um I forgot but it’s where the “o” sounds like “eh,” and “ti” as in martian (Swivelchair update 04.24.09: its “o” like woman [“wimmin“])
(OK all you linguists, wipe the tears of mirth from your eyes, hold your aching sides, ROFLOL!!! right?)