I went out side one morining and noticed all 4 tires were flat on my prelude and the one tire had a knife sticking out of the side wall. Road hazzard I think not. But I made a phone call to my recent EX-GF at the time and said "Thanks for showing me how much you still love me sweety!" Then she laughed and hung up the phone.
Thats the only time I can remember when I had something strange sticking into my tire