I nearly crashed once, when a seagull shat on my windscreen when I was doing 70 on a dual carriageway. I'd just gone under a bridge and all of a sudden the entire windscreen went white, like someone had thrown a sheet over it.
It was thick, gloopy shite too, to the point where I wondered if some vandal had emptied a can of white emulsion from the bridge. It took all the water from my washer bottle to get it clean, and when I got home, the car was splattered along both sides.
And be careful if you have a sun roof, too. DP once had an old jag with a sunroof and a seagull managed to shit through it. Luckily, it all went over his vile ex, not a speck on him, and the upholstery was leather, so fairly easy to get the crap off.
She was covered in it, it was all in her hair and everything. Sadly, it was in the days before mobiles and she wouldn't let him take a picture.
I hate the fuckers, but I have a bird phobia so I have an excuse. I had to get a supermarket security guard to chase one off the roof of my car once, it lunged at me every time I went near the car and I was bloody terrified.
If I hadn't had CBT, I think I'd have to avoid the coast.