MT Sargeant at a famous training camp SW England points to a rear spring on a land rover and enquires;
"You FEBA (not my real name of course) what's this called"
"It's a spring sarg"
"Yeah but wot sort of spring is it?"
"A leaf spring Sarg"
"To give it it's full name son, it's a semi epileptic spring"
Priceless.