I still think he was going to rob the place but lost his nerve.....
Maybe he realized he should have put the pantyhose over his head BEFORE he walked in.
That thought crossed my mind as well. You should have seen the guy's eyes though - he had definitely ingested some sort of pharmaceutical before walking in the place. He had the coldest, most soulless look I've ever seen.
The moral: Wait until AFTER you knock over a Denny's before taking the bong hit.