In every universe my friend.<p>I have no idea what the context was for Naval, but if someone walks to you and say &quot;excuse me I hope I am not interrupting,&quot; REGARDLESS of your conversation (because you are in a public place), you stop and give them 15 seconds.<p>For how do you know they are not telling you your car is being towed, or your kid is being taken away, or you dropped your wallet.<p>If it were Obama who walked to them would they have stopped for 15 seconds? If yes, then what is the difference?<p>At the very least say with a smile that you are sorry, but this is really not a good time, but they can email you if it is not urgent.