There are many weird rituals all over the world. In Russia, it is customary for the person who is going out to sit in a place for a minute before he or she ventures out. This is actually rooted in a traditional Slavic custom Domovoy. Domovoy is believed to be a spirit who advises the traveler on what things to pack and the care to take while traveling. So when a person sits down it occurs to him to carry a particular item with him or special care to be taken.
This ritual is also followed in many places over the world. Many communities consider it a bad omen if a person who is leaving the house trips or stumbles. The person is then made to sit for a minute before he can leave.
Some tribes have weird rituals of dancing with the dead or even dining with them.
Goanese Catholics had a ghastly ritual of burning the Jew.
Do share your experiences with rituals. Amaze the others.