Yes it can be fixed. In fact, there is at least one other active thread with the same issue. I am sure someone will chime in with specifics. Short of that, try the search feature! Enjoy!
Try doing a search here and on RennTech. I have heard of this happening before, I think it was caused by the wire in the steering wheel coming loose over time. It isn't to hard of a DIY.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
If you are fat, maybe it's your belly hitting the horn button :-)
While I know its not your problem, here's an amusing little story:
I once had a car that had the ignition on the steering column. I also had just a few keys on a plain keyring. Every once and a while the other keys on the ring would flip over the top of the ring under hard braking. If they flipped just right one key would flick into a gap in the plastic around the steering column. It would then short out the horn button and the horn would come on and stay on. The first time this happened it took me about ten minutes to figure out why the horn was going off :-(