While I agree with the "not bloodly likely" crew on the Throat of Force trick, I have to point out a correction:
The spell says the Wall must be anchored on all sides.
No, it doesn't. Some of the other "wall of" spells require an anchor point (wall of stone must be supported by existing stone and wall of ice requires an anchor), but wall of force has no such requirement. You can create it floating in mid-air if you want. The only requirements are that it must be a) unbroken and b) vertical.
The only wall spells that you could conceivably anchor to the inside of a monster's throat are wall of ice and wall of thorns. But when trying to block a red dragon's windpipe, neither ice nor wood is a terribly effective obstacle.