when i was young i remember that my uncle used to always sit on my grandmothers stairs waiting for the postman to come with his cheque every week! :o) i used to annoy him by saying i was going to run and get it before him and rip it up, he was such fun and always made me laugh. He died about 17 years ago, aged 28.
when my little girl was young she would constantly stare up my grandmothers stairs and smile as if there was someone up there, when she got older she would go up and sit there and talk and laugh to herself run up and down the stairs and click the letter box. It totally freaked me out.
my cousin had a baby a year after me and he did the same thing looked up the stairs and smiled babbling to himself as if someone was talking to him making him laugh.
I have no explenation for why the kids do it but i do believe that there some sort of spirit world out there.
me and my cousin just hope our kids dont turn into the little guy off sixth sense!!
:o)