It's the visiting ministerial delegate's birthday and the mayor is determined to impress him with a wristwatch as lavish gift. On top of preparing refreshment, which the mayor keeps ruining, Van Leemhuyzen is ordered to collect it, wrapped, from Gert, who is flat out too. So it gets switched with Samson's gift for his canine friend, a blue marker. To cover up, Van Leemhuyzen pretends it's a magic marker, which turns blue everything someone draws with it.
—KGF Vissers