I have been for real proposed to more than once by people I didn't really know. Once I was working at Arby's and this customer would always come in and tell me how much he loved me. (He was on the autism spectrum.) I was always super nice to him and would sometimes even give him a hug. After about 3 months of coming in every to every other day, he finally proposed to me at the cash register -ring and all. I had always joked with my co-workers that "my boyfriend" was late. Little did I realize, they thought I was serious, so there I was with my co-workers and all of the customers standing around clapping and smiling and "awww"ing. It was awful. I didn't want to make him feel bad. I didn't want to say yes to save him from being embarrassed and then take it back. I still feel awful about it.
Another time, I started walking home from a job in the mall. This guy in a really nice suit who had been trying to flirt with me everyday that week kept following me asking me to be his wife. I didn't even know his name. I started walking faster. I went outside in the rain, through the parking lot, and was standing in the grassy/muddy area waiting to cross the street. He had followed me, and finally threw himself on his knees in the mud begging me to at least take his number. He looked so pathetic in the rain. People were driving by and staring. There were people waiting for the bus watching and I just knew they were going to think I was an awful person. I finally accepted his number after begging him to get off his knees and to please leave me alone.
People are crazy.