The "cooties" of the 21st century are apparently called "chills." Today I got really annoyed with my students during an upbeat probability activity. They were working pretty well in groups, but they kept running back and forth during the stations to poke each other and yell, "Chills for life!" I let it go during the activity because everyone was doing the work they were supposed to be doing, but while I was going over something whole class, one of my kids got up and walked across the room to pass on the chills.
I kind of got mad, and my brilliant solution was to tell them that I didn't want to hear about chills in class ever again. In fact, I sacrificed myself and took the chills, and they'd all better stay away from me or else they'll catch it. The word didn't come up the rest of the day.
Watch out. I've got chills for life.