Barney Is An Asshole
I've never understood why the characters in cereal commercials just don't buy a box of their own. It'd certainly be cheaper than all the costumes and props used just to steal a bowl. Then there's instances like this where Fred is on some sort of trip to a haunted castle. Of course it's the perfect time for some Fruity Pebbles and dammit Barney. Just dammit, can Fred just eat his fucking cereal in peace?