Guinness Cap
Cap - From a signed and dated bottle of Guinness Stout gifted to my parents on the day of my birth. They had saved the bottle for 6 years. Then, one day my dad was working in the yard and asked me to go and get him a beer. When I did not find a PBR in the fridge, and without understanding the significance, I popped the top on the Guinness and took it out to him.