How about the Bloody Mary urban legand?? This one was popular with us as kids around here.
Mary, the little girl who was so ill she went into a coma..but she didn't die, the family thought she did.. so they buried her alive. The mother thought she heard her daughter scream from her grave the first night... no one believed her. So a couple of days later she convinced them to dig up her grave.. When they did they saw scratches at the top of the coffin and her fingernails were bloody.
Following these instructions you may be able to see Mary: At midnight on Friday the 13th, turn off every single light in the house. Go in the bathroom and turn on water in the sink and shower, flush toilet and say "bloody mary" 5 times and she will appear in the mirror. If you don't turn on the light fast enough, she will stab you in the back.
Wow, did that one ever make me scared of a dark house when we would "play" it. We never followed the Friday the 13th rule...it was whatever night we wanted to do it.