Cracked glass, why it sickens me so?

[Stevie50001]

Why when i look at cracked glass (like a bus shelter screen when it goes all bity but is still intact) do i feel repulsed? I dont mean in repulsed because someones broken it....rather the actual way it looks makes me feel ill and cringe? I thinks its that special stuff that doesnt form large shards when its impacted, rather forms to me anyway a sickening pattern of tiny irregular sharp looking bits. When its shattered completely and on the floor im ok its just when its still held up like a web of them all together. Sounds crazy but one of my friends has said the same thing to me so im not the only one!