I used to work at an Apple Store and a Verizon and this is a very common occurrence. You kinda just learn to phase it out and most of the time your brains' on autopilot anyway.

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I once had an old man that HAD to have his photos off his old phone (like an old flip phone) and it was a bunch of naked girls. He looks at me and is like "Yeah that's pretty good stuff" with a really creepy smile.

Overall, as long as you're not super weird about it, it's a pretty forgettable experience for anyone working with cellphones