You know you are in Gymnasium when...

•  All classroom doors are locked at all times.  Unless the teacher is physically holding it open.
•  ...which leads to a heap of people outside classrooms waiting for them to be unlocked.
• There isn't a lunch hour.  You eat what you packed, when you have time.
• If the teacher doesn't show up, there isn't class.
• If you're late for class in the science building, you're screwed. The outside doors are locked back up 5 minutes after class starts, and there is 2 interior doors, which are also locked.
• Everybody says bad words in English.... and most people have quite a large vocabulary.
• Most of the teachers speak at least 3 languages... and English not necessarily one of them.
• You have to check the schedule every night online, so you don't look like and idiot waiting outside a classroom when class was cancelled.
• The schedule is different every day, and usually involves walking all over the campus in between the different schools with about 3,000 other people.
• You are with the same awesome group of people for most of the day.
• Close friends greet you with hugs and kisses.
• You take the public bus to school every morning.
• People come up shouting 'naaaaaaa' as a form of greeting.
• An entire conversation between classmates can just consist of the words 'naaaa', doch', 'nein', and 'naja'.  
• You converse with the teacher privately the grades you get per term.
• The blue bins are for Plastic, the yellow bins for paper, and the blue bins are for rubbish.
• Teachers will say 'also' and 'Hallo' to attempt to get undivided attention.
• PDA is not as looked down upon.
• You DEPEND on the Vertratungsplan for guidance.
• HomoFaber will be making an appearance sometime during the year.
• Mini  Foreign Exchanges are quite prominent.
• You get food at a Kiosk because Mensaessen sucks.
• There is a Klassenbuch.
• If you see your name on the Vertratungsplaner, it's probably not a good thing.