Polterabend is a German and to a lesser extent Polish, Austrian and Swiss wedding custom in which, on the night before the wedding, the guests break porcelain to bring luck to the couple's marriage. The belief in the effectiveness of this custom is expressed by the old adage: "Shards bring luck". The expression is derived from a time when the word "shard" referred to the unbroken clay pots of pottery makers, and not just the broken pieces. It was said that a full jar was a lucky thing to have, therefore the expression "shards bring luck".

A bachelor party, also known as a stag weekend, stag do or stag party, or a buck's night, is a party held/arranged by the man who is shortly to enter marriage.