Usual suspects are that one cousin who's a cheep skate and has notoriously bad behaving children, or the well meaning mother that talked another family member into "getting you used to kids" in hopes of having more grandchildren.
That one lazy co-worker who preys on the kindness of others to get their work done for them. You know who you are.
"Let me get back to you on that."
*spook move out the back door 10 minutes later*
Later phone call from John, "Hey I missed you leaving, so what do you say?"
"I just got *insert excuse*, sorry."