It is hard to resist in the case of prominents, in particular politicians.

You have to be very good in German and understand the Bavarian dialect to get this old one from the early sixties (ab)using president Kennedy's name:

Franz-Josef Strauss landet in Washington. Der Praesident empfaengt ihn an der Gangway und stellt sich vor: "Kennedy" Strauss antwortet: "I di aa".

"Kennedy" is exactly pronounced as the Bavarian dialect "I know you".

Wolfgang Hell