Overheard in a gas station...

As I stood at the counter of my local gas station/convenience store, I overheard one cashier say to the other cashier:

"Oh, I have to update you on that Hitler thing,"

Clerk pauses to ring up my purchase, thanks me and wishes me a good evening. As I walk away, I hear him continue:

"I've told you before how all my friends call me Hitler, right?"

???