A classroom slideshow that educates you through fear. They all have the same narrator and use some kind named Billy as an example, something bad always happens to Billy.
Fifties slide show examples:
And thats why you should never talk to strangers. Because they all have knives. Isn't that right Billy? Billy wouldn't know. His mangled corpse is now being raped by a depraved psychopath, all because he talked to the local ice-cream man. BOO!
Wise-acre is essentially synonymous with the terms jerk and jackass. One defining feature is that a wise-acre enjoys comedy more than anything, and therefore an insult comic or a practical joker would be called wise-acres. It has fallen into disuse recently, but it's still there.
Yeah, Tom's a real wise-acre. He screwed the top of the salt-lid off and when I went to pour it it fell off.