derives its humor from the fact that the English verbs "to get" or "to obtain" translate as the German verb "bekommen", which is in turn similar to the word English word "become" (in German, the word for "become" is "werden"). So what the customer actually wanted to express was the wish to purchase a beef patty sandwiched in a soggy bun, not to become one.

Leider getilgt aus:
http://en.wikipedia.org/w/index.php?title=Germish