Today at the climbing gym I saw a guy wearing a shirt that said Steins Gate on the back, in old-timey Gothic lettering, above the sort of eagle you see on German heraldry/insignia/etc. and some more text I couldn’t make out. On the front of the shirt it said “[something] in deutsches Bier”. Do you have any idea what this is about? Is this a German weeb in-joke?

I guess there is a lot of madoka, but there are multiple madoka posters on my dash, so you're the anime I've never heard of poster