Last week, I was having a lunch with 5 coworkers who are programmers btw. The discussions led to a discussion about wild bird.
I don't remember why we started to talk about Penguins but the largest dude said:"Penguins are not birds"
I was like

and others 2 dudes were convinced by him, the third was 'not sure' by saying: "but it looks like a bird"
The other dude said: "Birds have specific characteristics , Penguins don't have them, penguins have fins ..not wings."
The largest dude said:" Penguins also don't lay eggs,they are mammals and and they have leather skin and not feathers'
Me: ".... guys I think you are confused between Penguins and seals?!"
The large dude:"WHat?? no we are talking about Penguins?"
Me:"You mean the animal of white and black? the one that looks like nuns?"
the two dudes:"Yes!"
I was eating chicken, I pointed the chicken with my fork and said sarcastly: "Well guys.... if Penguin are mammal then Chicken are mammal too!!"
I enjoyed when I showed them on wikipedia: Penguins (order Sphenisciformes, family Spheniscidae) are a group of aquatic, flightless
birds living almost exclusively in the Southern Hemisphere.
how far stupid people can be???
Not so much different than that woman at my work who said fish weren't animals. Humans are doomed to "stoopidity".