Rotten Curdled Milk Spraying From The Mouth Of A Wizard

Wizard's apprentice serving up some lunch
Milk that's been left sitting out in the sun
Sandwich made with expired mayonnaise
Wizard is working on magical spells

Chugging the drink and inhaling the food
No one realized it was totally old
Suddenly a magical spell is reversed
Wizard is now a fountain spraying out mush

Knocking over tools and potions
Cauldron gets tipped over also
Spraying mush all over the castle
Falling down a spiral set of stairs