A CreepyPasta of average fame, Laughing Jack is what is known as a clown. He is, of course, murderous. His preferred method of killing is slicing open the stomach of said victim, removing the inards and stuffing the body with candy. Before he kills his victim (usually a young child), he becomes "imaginary friends" with them. Said child is then comfortable with Laughing Jack coming into their room, and will suspect nothing when he murders them. In the original CreepyPasta introducing Laughing Jack, it is said that after the parent discoveres the boy is murdered, they accidentally stab the boy in the heart, in an attempt to stab Laughing Jack. When the authorities arrive, it looks like the parent had murdered the boy herself. The parent was charged with insanity and was sent to a mental institution. There is never an explanation for what happened to Laughing Jack, so we can only imagine that he is still at large.

a half-assed laugh that you give as a reaction to a stupid story or comment, pity laughs are usually used when the story or comment is ment to be funny but really isn't

When you are irrationally emotional and don't know whether to laugh or cry. Someone says something funny and you proceed to do both.

When a person laughs way too long at another person, thus making the situation horrendously awkward for everyone.

Another name for the Jack of Diamonds (also see: suicide king). In some variations of poker and black jack, players must chuckle everytime a Jack of Diamonds is played or drawn.

To laugh at an array of random things; to laugh a whole lot.

A laugh produced after stating a joke in order to drown out everyone's silence when said joke was lame. It's often used as a preemptive strategy to appear funnier than one actually is.