I hate it when that happens, the enemy sometimes look like allies if they're covered in just the right amount of friendly ink.

Spy!

I had a similar experience once:
I just got splatted by this guy and I take a look at his gun. I see an orange-coloured N-ZAP and I think to myself "Oh, he's using the 89 variant, how funny I'm using the 85..."
And then my orange ink fades, revealing it to be an N-ZAP 85.
"Oh! Lol."