Help w/ horn!

[nautiquelfe]

The other night my car was parked outside and the horn just started blaring. I do not have the keyless entry or security system that I am aware of. It went off for about 15minutes then stopped. Now the horn is not working at all. I checked the fuse and its fine. The tiptronic controlsl works perfectly. The last couple weeks the horn did seem to be a little sensitive to the touch. Anyone have this trouble or ideas? I had considered swapping the steering wheel to the 3-spoke style and having the 4-stalk option added but am trying to save up to do so.