How about when you're shopping? You've got your purse on your shoulder, drinking a smoothie & carrying a basket full of groceries and they stop and ask you for help.
I ignore people. If they are REALLY persistent, I'll just tell them I do, but I'm not right now and show them to someone else.
I also had a seasonal team member run up to me and start bitching at me (I was off the clock and shopping) and asked why I just ignored some guest that was wanting something found that wasn't on the floor. Nevermind the fact that it was THEIR job to do and not mine (they had a PDA and a walkie).