Smooth peanutbutter

After opening a jar of peanutbutter during the lunch, I fel silent. I couldn't find the regular knife strokes that had burrowed into the peanutbutter, but I saw a completely smooth hole...

[ what had happened..? ]

The mystery of the smooth peanutbutter...

After a short while people noticed my confused staring into the jar. And then I knew it, mystery solved and I could digg into the peanutbutter with my knife without any reservations...

[ someone had simply used a spoon... ]