Usually, I'd say something like a joke or some event in my life ... but those are simply causes ...

The truth is the striped muscle (also called voluntary muscle) used when you want to make a movement. You may also be told that it is called Skeletal muscle, this is because it is attached to the skeleton.

The striped muscle is used in conjunction with your arms and legs and are also found in your face and jaws, so they are used when you smile or frown or eat and drink.

See, that's what really did it.


<-- Note the striped muscle at work.