Disturbing Corn flakes ad that could be lost media.

This happened in 2018 for an advertising project at school when our professor was showing us different examples of adverts for our project.

I remember he showed us one ad about coca cola and another one about Corn flakes.

The Corn flakes ad was much more disturbing and unsettling than the coca cola ad.

it opened with a man, plump and wore glasses (all i could remember) who sits in a room with a bowl of cornflakes infront of him. A few seconds later, he starts freaking out and a dark shadow like figure pops up and dissapears continually. The man then starts yelling "CORN FLAKES" as the creature gets closer to him.

Thats about all i can remember, something else i can recall is that the ad was most likely from the mid 2000s as the cornflakes box was similar to the one i saw while researching.

Researched for a while now and came up with nothing, maybe yall can help?