Save as Untitled-1.psd? Oops, no
It is 2015, and computers still suck. Here, Photoshop suggests saving a file as Untitled-1.psd:

I press Enter and get slammed in the face:
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Hey, wasn’t that you who suggested the name? How about figuring out in advance that the name was occupied and suggesting, I don’t even know, Untitled-2.psd?