Since I am stupidly absent-minded, yes, a lot. It happens most often at work.
Me: I need something from the back!
*goes to the back, gets distracted by something shiny*
Me: Crap, what was I here for again?
It happens at least once a day, more on busier days. :( Really, I'm at risk the second I walk away from what I'm doing to get something else.