You have to break through a wall so you can approach the checkout counter from the wrong direction. But once you do it the cashier will give you $30 in "change" without you ever having paid!

Only problem is when you leave you end up back in the entrance to the store, until you die.

SCP or Kool-Aid Man, I have to squint to tell which

Hahaha, and here I thought my eyes were just playing tricks on me and I didn't look closer. I even saw the "-" and initially thought the same thing but then I, wrongly, assumed it was just the font and it was a subtle "~".