I think this gets classified under those things not to say around aviation people. Best one from personal experience, im in radar working traffic, and a teaching assistant is behind me. My phone rings (its on vibrate so the TA cant hear it), and I realize I had forgotten to call my mom, "oh shit!" I proclaim as I begin to think about the speal I'm about to get from her. TA freaks out, "what what what!" Just the mom, dont worry about it. He wasn't to happy with me to say the least.