Anecdotal and not really a big problem, but it took me having to put my coke in a coffee cup to be taken seriously in meetings to really "get it".
Humans are guided by stereotypes and superstition and not scepticism and scientific reason. And if there is an individual that is sceptical and demands scientific reason, they are punished socially for it. This makes homo sapiens look a bit bad in my eyes.
Don't think putting a can of Coke in a cup was the problem there.
And
"coke" and "Coke". Different things.