There were noises accompanied later with really noxious smells in a closed room with no one there but me.
I'm not going to say more than that, apart from the first time I heard the noise I thought I must be imagining it, the second time I thought I'm sure I didn't imagine that, and the third time a really bad smell came with it - kind of proving I didn't imagine hearing it.
In between each was 10 to 15 minutes, and each time I'd become engrossed in the tv again and forgotten about the last time.
The 3rd time with the smell - really freaked me out.
It wasn't the parents, or smells from outside, or etc - it was real observable noises and smells in a closed off room with only me in it.
And I STILL can't bring myself to believe in this stuff, there must be an explanation.