Came across a really great one the other night at work. At the hospital. Around 2:00 AM. In a Medical Terms dictionary.
gubernaculum /gu·ber·nac·u·lum/ (goo″ber-nak´u-lum) pl. guberna´cula [L.] a guiding structure.gubernac´ular
gubernaculum tes´tis the fetal ligament attached at one end to the lower end of the epididymis and testis and at its other end to the bottom of the scrotum; it is present during the descent of the testis into the scrotum and then atrophies.
Dorland's Medical Dictionary for Health Consumers. © 2007 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
AhhHaa! Now we know why men don't feel the need to ask for directions. They have a factory installed guidance system that got the boys where they needed to go. And reminding them that it has atrophied is only likely to bring up comments about how lack of use can cause atrophy in other structures; soooooo...
Try saying it a few times, goo-ber-nac-u-lemmm, GOO-BER-NAC-U-LEM! Gubernaculem. Kinda puts a smile on your face and takes your mind off of driving through that same intersection over and over and over...