I did this. My neighbour backed into me. And I honked before he hit me but otherwise did nothing. To an observer it may have seemed ridiculous but the reason is

I did this. My neighbour backed into me. And I honked before he hit me but otherwise did nothing. To an observer it may have seemed ridiculous but the reason is simple: I assumed he could see me and it wasn’t until it was too late that I realized he wasn’t paying attention and was going to hit me. By then I had no time to put the car in reverse and move, only to honk.