...Using the environment as a weapon becomes one of your most effective strategies.
...You can't tell the difference between line drills and one-steps.
...Mokuso looks like a huddle in American Football.
...You must pull your punches because the neighbor keeps complaining about all of the loud bangs.
...The neighbor yells "keep it down" everytime that a single student does a Kiai.
...You can go to the restroom and still hear every word that sensei says while you are on the toilet.
...A head shot creates a "Three Stooges Effect" and everyone in the dojo gets hit in the head.
...The class looks like a white gi monster with multiple arms and legs flailing in every direction.
...Every sparring session is a multiple opponent scenario because you have to dodge your other classmates, too.

when you have to wear your pads for practising tuls/kata

Judo;

- You have no problem transitioning to cage fights, since you're already used to being pushed into a wall.

~Donnie

when everyone is standing on that squeaky spot on the floor...

-A bubble in the mats suspends the whole class's training.
-Sine wave is no longer used because everyone hit their heads the first time they tried it.

-TKD_X

Restrooms? changing rooms? i wish we had those things.

when you trip on the guy rope when entering.

XMA will never happen...ever.

when the students are sparring and one falls through the window (yes that actually happened, wasn't hurt though)