The behavior is sometimes a response to shame from not being able to hang with the big boys and girls.
In some instances the behavior is the result of such a drunken level of stupor that the individual turns on his or her Lassie instincts and finds his or her way home like a K9.
Mike: Where the fuck did Amir go?
General Consensus: I have no idea!
Mike: Damn it! Amir squirreled again!