Stick your palm open under the stall wall and ask your neighbor, "May I borrow a highlighter?"
Say "Uh oh, I knew I shouldn't put my lips on that."
Cheer and clap loudly every time somebody breaks the silence with a bodily function noise
Say, "Hmmm, I've never seen that color before."
Drop a marble and say, "Oh shoot! My glass eye!"
Say "Darn, this water is cold."
Grunt and strain real loud for 30 seconds and then drop a cantaloupe into the toilet bowl from a high place and sigh relaxingly.
Say, "Now how did that get there?"
Say, "Humus. Reminds me of humus."
Fill up a large flask with Mountain Dew. Squirt it erratically under the stall walls of your neighbors while yelling, "Whoa! Easy boy!!"
Say, "Interesting....more sinkers than floaters"
Using a small squeeze tube, spread peanut butter on a wad of toilet paper and drop under the stall wall of your neighbor. Then say, "Whoops, could you kick that back over here, please?
Say, "Boy, that sure looks like a maggot"
Say, "Darn, I knew that drain hole was a little too small. Now what am I gonna do?"
Play a well known drum cadence over and oven again on your butt cheeks
Before you unroll toilet paper, conspicuously lay down your "Cross-Dressers Anonymous" newsletter on the floor visible to the adjacent stall.
Lower a small mirror underneath the stall wall and adjust it so you can see your neighbor and say, "Peek-a-boo!"
Have a funeral for your goldfish.
Compliment the person's shoes in the next stall.
Ask, "is it just me, or is that Eau de Feces I smell?"
Thanks to Tina Yes for sending in some tips!