"You should not cut your nails on Thursdays".

I was trimming my nails when my Grandfather said with a sigh "You should not cut your nails on Thursdays". I had never adhered to these superstition but out of curiosity I asked, "What happens when I cut my nails on Thursday?" He explained, "You see the weekend starts tomorrow Friday, Saturday and Sunday. It's difficult to open the beer cans and the bloody plastic namkeen packets without the nails." *Moral: Some superstitions do have a scientific reasons!