Originally Posted by
CritterMom
This could be the beginning of a seizure disorder, or it may be a one time thing. He may have seen a predator - a cat, or a hawk flying overhead, that you did not, and from his point of view, given that he could not get away, was of being staked out like a goat in a tiger trap. Or perhaps it was the noise.
Regardless, if you ever witness this again, the first thing you want to do is get some sugar in him. It can be some table sugar, a squirt of honey or syrup - whatever you have on hand. It will help him recover much more quickly, as you noticed.