"No way!" he replied, adding, "Slender Man is the worst creature you could possibly imagine, he's faceless and has very long arms that can reach out and grip you tightly. He likes to eat children's souls and amazingly, he can teleport himself!"
"Teleport himself?" I questioned, dumbly.
"The ability to transfer matter from one site to another without traversing the physical space between two points ... don't you know anything Dad?" replied my innocent, rolling his eyes heavenwards.
Apparently Slender Man is yet another fictitious creation that has gone viral, thanks to internet phenomena such as Creepypasta and Minecraft.
In an effort to keep ahead of my children who are now exploring weirdo places, I downloaded a couple of games to review what Slender Man is really all about.
I was bemused to discover he's just a re-creation of the same old spectre that's been frightening kids for centuries.
When I was young he was called "Bogeyman". I recall my grandmother describing him as being dressed in a long black cloak, and warning me about his eating habits.
Back through folklore history, Slender Man has existed under many guises, traditionally residing in dark forests and with a special liking for devouring naughty children. I was about to dismiss him as boring old stuff regurgitated, when I recalled something my son had nervously whispered to me.
"He's faceless and has long arms that can grip you tightly," he'd warned.
Suddenly, I gulped. That description doesn't sound like a fictitious creature lurking in the forest - it's a tax official I'm dealing with at Inland Revenue.