Best of Luck Küsus Poltertag?

I saw a group of guys wearing the following t-shirt the other day and found it pretty comical.

They were taking part in what seemed to be a bachelor party and were probably about six hours deep into their celebrations. Whether you agree or disagree with their sentiments, you have to admit that they’ve done a good job of getting their point across rather simply. There isn't much room for misinterpretation.

I couldn’t help but wonder which one was Küsus Poltertag…