Heh-heh - I did not know what a "tangerine" was at first. Someone told me it's a girl wearing a tanga (!!!). Since then, I have found out that it's a "mandarin orange," what we call a Nartjie (nah-chee)over here.
The mistaken identity does wonders towards keeping that particular tangerine on the back of your head...
Jokes aside - I find it works for focusing attention other tasks as well. With a nartjie, not a girl, that is (my wife'd kill me, otherwise