This happened last night
And quickly, I might mention, my stepdad's color-blind. So he gets blue and purple confused, and red and brown confused, and orange and tans confused, and yellows and golds confused, and reds and pinks confused.

Yesterday
Me: *sitting in car at gas station*
Stepdad: *gets back in the car after stopping at the gas station to get him tea and me Gatorade*
Me: Whazzat look for?
Stepdad: So I have my tea right? And I have a big bottle of blue Gatorade for you right?
Me: Yeah?
Stepdad: I'm walkin up to the counter and before the woman says anything, I say "....Is that blue?"
Me: *bursts into laughter*
Stepdad: *chuckles* And she replies... "No. It's purple." So I said "I'll go get a blue one then." And she says "I think it'll be easier if I go." and she goes and gets one. But I thought I'd share yet again, another Color-blind experience.
Me: *calms down* I think the best part is that you didn't say to the cashier "Hello" or "Good evening" like normal, you greeted her with "Is that blue?".