|1.||72 hour vacation|
A reference to the length of time a person can be involuntarily admitted to a psychiatric hospital for observation.
The suggestion is the person you are dealing with is acting in such a bizarre and/or aberrant behaviour that they should be put away for observation.
1st Dude: Let's trash a few houses this weekend and start some fires.
2ndDude: Dude perhaps you need to take a 72 hour vacation.