Complete power failure. How/why?

[IwantMKIII]

Just curious how this could happen. Went to start the car (it was already warm) and i think i may have released the clutch a MM too much so the clutch switch disengaged (all i can think of) and had complete power loss. Car alarm started freaking out, horn started going but didn't (sounded like batt was almost dead for the horn), then it went off, everything. The lights wouldn't work even. Bascially it just freaked out.

Disonnected the battery and reconnected only for the alarm to actually fully work in the parking garage. Eventually after a few more times i disengaged the alarm. What would cause this? Or should i just not worry?

 

[hvyman]

mine has done that a couple times now. for me the positive cable at the batt was not getting a good connection even tho it was tight. just a thought.

 

[IwantMKIII]

^this is a good though and very possible as i've recently disconnected them, maybe they weren't tight enough.

Im still curious WHY this happens though.