system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do you sometimes get tiny muscle spasms in specific places, like a tiny spot on your thigh or a finger twitch?
gpt
The body fires an electrical charge through your nervous system as your brain commands for movement. No one is quite sure what causes a twitch or a cramp due to the randomness of it happening (Hard to investigate in a lab). But the theory behind it  is that these electrical charges are being randomly sent off to affect the muscle to move. Due to your self not wanting to move it it dosn't fully contract.