How to Make Guys Stop Throwing Things Down Your Shirt

So earlier this year in January, I was at a movie with my boyfriend of three months--the movie was "The Green Hornet" and it's terrible never ever see it. There we were waiting for the movie to start, I--being my innocent self--was sitting there so harmlessly, daintly nibbling on my popcorn when Chris rudely and maliciously tosses a piece right down my shirt. So being the lady-like female that I am, I dug it out of my shirt and ate it looking completely unphased. Then exercising the first, most equal retaliation that I could think up, took a wad of that salty, buttery goodness and shoved it straight up his nose.
Needless to say, he was quite horrified by my action. Such that he could not speak for a minute or two. When he recovered, he stared me in the eye--popcorn hanging from his nose--and said, "I cannot believe... you just did that."
I smiled innocently, "Don't throw popcorn down my shirt."

Let's just say he never did that again. Then again... we did break up three days later... Correlation? Possibly.