We always used to turn around 3 times, after saying, 'Good morning/afternoon Mr. Magpie'. (I still say it, but have omitted the turning around - unless viewing the magpie from somewhere where I won't be spotted!)
No, I don't really believe in all this superstition ... but still ...?
I still hold my collar when I see a hearse and mutter, "Touch your collar, never swallow, never catch the measles. Not for you, not for me, not for all the family." (What's the origin of this, I wonder?)
Pictures falling off a wall portends a death.
Bubbles on top of a cuppa foretell the arrival of an important letter.
Crossed knives on a table is a dreadful sign.
No! No! It's all eyewash!
Yet I still put silver in a purse that I'm giving as a present. I couldn't possibly not!