He answered the deeply divisive question by saying he was "fundamentally opposed" to the idea, going as far as to say he would ban the tropical fruit from pizza if he could.
The storm of controversy was immediate.
It also inspired new inventions constituting madness of the highest order.
Seriously. It was a bloodbath.
This is no laughing matter. The Pineapple On Pizza debate has plagued humans for decades, and a consensus has never officially been reached.
To throw yourself into the firing line and admit to one preference over the other is arguably one of the most dangerous things a human being can do. And that includes getting a Twitter account.
Long story short, the Icelandic leader was forced to release a statement on the issue clarifying his stance, offering some sort of neutral pineapple-scented white flag.
"I like pineapples, just not on pizza," he wrote on Facebook, in both English and Icelandic. "I do not have the power to make laws which forbid people to put pineapples on their pizza. I am glad that I do not hold such power.
"Presidents should not have unlimited power. I would not want to hold this position if I could pass laws forbidding that which I don´t like. I would not want to live in such a country.
"For pizzas, I recommend seafood."
Let's not even touch on that last remark.
Mr Guðni has enjoyed huge popularity since he was elected President of Iceland last June.
He's known for his informal leadership style, and was even once seen stopping by a Domino's on his way home from the office.
Perhaps his likeable nature has saved him this time. But it's safe to assume people won't be quite so forgiving in future.
But hey, at least you're not living in Sweden.
And on that note, it's time to log off.
