Superstitions of Greek people

It's important to say that this superstitions come from religion or paganism

Like some people here in Mexico, greeks  think that if,someone sees a cat, this is supposed to be bad luck for the rest of the day.

There are also one that called my attention, and it's the expression Piase Kokkino, and takes place  when two people  say the same thing together at the same time,they immediately say "piase kokkino"that means "touch red", and both have to touch something red from the environment.
They have to do that because greeks believe that say the same thing is an Omen and then will get a fight or argument if don't touch something red.
What do you think about this ? ,please let me know