Horn randomly chirps a couple times when my Prius is parked.

Hello everybody,

So I've noticed a few times now that my Prius horn honks about 5 times consecutively At random times while its parked and nobody inside. All the doors and trunk and hood are fully closed and the vehicle is locked when parked. I'm baffled as of what could be causing this. I've only owned my Prius for 2 months so I'm very clueless when it comes to it. Can anybody suggest what might be wrong??? It seems to have a mind of its own lol thanks!