Electrical Gremlin Attack

[brandung bus]

Last night my wife wakes me up at 1am saying the neighbor woke her up knocking on our door saying our alarm is going off in the garage. That's weird we don't have any alarms??? I go in the garage and my bus' horn is blaring at a decibel level I didn't even know it was capable of. Seriously it's normally this wimpy vw "meep meep" noise and last night I could barely get close enough to the horn to disconnect the wires from the horn it was so loud. Granted, I've never laid on it for an hour nonstop. The horn button wasn't depressed or stuck but I think I felt two connections near the spade connectors that lined up together so they may be touching bare wire there? Anybody ever have anything like this happen or have any ideas, do you think I may have a drain on the battery. I will probably learn more myself when I look under there. I pulled the wires and went back to bed last night.