The other day I had quite an interesting ride home on the subway. Sitting next to me was this sweet looking lady with all her shopping bags. I was busy reading my book, but couldn't help noticing that she seemed to be having a conversation. A couple times I glanced in her direction to make sure that she wasn't trying to have a conversation with me. Then I realised that she was having a quiet two-sided conversation.... with herself!
I'm not kidding. She would cock her head and look to one and "mumble-mumble-mumble", then she'd cock her head to the other side and "mumble-mumble-mumble" back. It was very quiet so I don't think anyone else noticed, but as I was sitting next to her I did. She did the for about 5 mintues and then she opened up a box of black grapes or berries and popped one into her mouth. A second later she popped another one, then another, then another into her mouth (without having swallowed any of the others). I think she must have had about 5 in her mouth, looking rather like a hamster storing its seeds, before she started chewing and swallowed them.
Harmless, but very amusing!