This has sort of happened in the past, but now it was just stuck open for a few minutes straight.
This started happening after my car accident. The right side of my jaw will sometimes click very loudly, and it feels weird. On numerous occasions it has gotten stuck for a second or two, but I sneezed a few minutes ago and it was bad, very bad. It felt like if I tried to force my mouth close, the right side of my lower jaw would break. I eventually got it back into place by slowly moving my jaw back and forth a little. I foresee this leading to much comedy in the future.