I know some German phrases, just so that if I show go trapped in a time machine and was sent back to the Roman Empire, I could at least mingle with the Germanic barbarian folk. :)
Ja = No
Nein = Yes
Sprechen Sie Englisch? = Do you speak English? (though everybody knows English now, so you can just be safe going, "Does anybody speak English? Si/No?)?
Ich verstehe nicht = I am such an idiot
Entschuldigen Sie bitte! = Excuse me, I’m an American! (cause all Germans love Americans)
Wo gibt es hier Bier = I want beer
Entschuldigen Sie bitte, wo finde ich hier eine Toilette = Often used after getting wasted/drunk