He then holds up an object resembling a key or a bottle opener. It can also be used as a bottle opener. This is the version that famously features a bottle opener in the front handguard. He most notably invented the crown cork bottle cap and bottle opener. Furthermore, the end of the bayonet scabbard can be used as a bottle opener. Foreigners and Chinese alike informally refer to the building as "the bottle opener". A bottle opener is required to drink the bottle's contents. To open these bottles, a bottle opener is generally used. A Bob and Doug McKenzie bottle opener was included in every DVD. Some sommelier knives have two steps on the lever, and often also a bottle opener. Invented at the same time as the crown cork, it is the original bottle opener. The four-eyed face on the original US album cover was an antique bottle opener.