Here is my submission for today:
If, in the middle of the very long story you were just telling your mother, she says, "Hang on, hun, I need to run to the bathroom," what she means is, "Wait there and hold that thought until I return."
It does NOT mean:
"Keep talking. Follow right behind me. Stand outside the bathroom door and continue your story, only do so in a screaming voice to be absolutely certain she heard you."
Now you know and knowing is half the battle.