The greatest photobomb of my life: I (blue) don't know that family and they didn't know I

@catfluff, summon pls

if the guy in blue photobombed the family's pic, then how did he get a copy?

@mr_pigeonwizard

The greatest photobomb of my life: I (blue) don't know that family and they didn't know I was there!
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(TITLE FROM REDDIT r/pics)

But why's he wearing two different shoes?