I cast wall of force as a sphere (lets say about 1 foot in diameter) at the tarrasque my party is fighting. As it is cutting through the creatures space when it appears, I can choose which side the creature is on.
I choose the inside.
Will I get a beachball sized tarrasque, crushed to death inside an indestructible wall? Can I use it to completely cut out a creatures heart or decapitate them?