In the UK, they say “touch wood” to avoid bad luck.
In the USA, they say “knock on wood”.
In Sweden, they say “peppar, peppar, ta i trä” which means “pepper, pepper, feel wood”, which means ????
My brother went to church camp and they made them make shields and swords to reenact the crusades. Nice right? Sickening.
If you hålla tummarna (hold your thumbs) in the USA, UK, or many other places, they will have no idea what you are doing. They cross their fingers instead. Which may be why they’re so unlucky.