I have just seen the word "Apfelwein" in the "What are you drinking now?" thread. That gave me the idea to ask what other German words you may use from time to time.
Other words I know ad hoc:
Kindergarten
Blitzkrieg
Oktoberfest
Christkindl (pmsummer uses it :yes: )
Sauerkraut (of course, of course...)
Krauts
Gemütlichkeit (?)
Heimat (?)
Frankfurter (Würstchen)
Kaputt (I heard that for the first time in a Columbo episode)
...some more?

Other words I know ad hoc:
Kindergarten
Blitzkrieg
Oktoberfest
Christkindl (pmsummer uses it :yes: )
Sauerkraut (of course, of course...)
Krauts
Gemütlichkeit (?)
Heimat (?)
Frankfurter (Würstchen)
Kaputt (I heard that for the first time in a Columbo episode)
...some more?