User can make others laugh to death.

Pros:
-user can effect anyone
-user can effect themselves
-user can control pain factor
-user can control speed of death

Cons:
-user will prey on others
-user will be sadistic
-user will be very tempted to effect many people at once
-user's range differs
-user may be called a maniac

Weakness: sanity
User will find it harder with more well minded people