"No!" said with emphasis and clarity ensuring all around them know that they really do mean NO. It's only later in life that we seem to learn "No, thank you." or "Not today" or, even better "Sure, I can shoehorn that into my already crammed life where I am barely holding the doors at bay. What do you need?"
OK - sarcasm aside, there is so much that needs to be done and so much that I want to do and time always seems to run out on me. I think I have decided that there just needs to be about 10 more hours in a day. Yep - that's what will solve all the problems of the world.