live one

Etymology
Possibly an allusion to hooking a particularly lively fish on a fishing line.

Noun

 * 1)  Someone who is easily fooled, victimized, or ridiculed.
 * 2)  Someone who is eccentric, nonconformist, or otherwise peculiar.
 * 3)  A person, thing, or situation which is particularly interesting, noteworthy, or urgent.
 * 4) * 2007, Tom Lawrence, "Area DUI crack down reduces arrests," Black Hills Pioneer (South Dakota, USA), 2 Jan. (retrieved 3 Feb. 2009):
 * "We got a live one here," he said as he speeds up in pursuit of a car.
 * 1)  A person, thing, or situation which is particularly interesting, noteworthy, or urgent.
 * 2) * 2007, Tom Lawrence, "Area DUI crack down reduces arrests," Black Hills Pioneer (South Dakota, USA), 2 Jan. (retrieved 3 Feb. 2009):
 * "We got a live one here," he said as he speeds up in pursuit of a car.

Usage notes

 * When used in the singular, almost always preceded by.

Synonyms

 * ,, , , ; see also Thesaurus:dupe
 * ,, , , ; see also Thesaurus:strange person