This video had me crying within the first minute. Is it just because I love Germans so much? That’s very possible, but I think that it’s because this is hilarious and because English is really damn hard and there are so many things which can be misinterpreted.
WARNING: Do not watch this video if you are eating or drinking. You may choke.
A “party pooper” is a person who sucks the fun out of a social occasion. Other ways to express this idea include saying that someone is a killjoy, a wet blanket or a spoilsport.