That happened to me a few times when I was presenting our stickers to some visitor and friends.
"Yes, OK, nice, but what are they for?" and then me 

I did that few times like that but then it becomes "Come' on people, it's fcn stickers! ""made to stick on something"" to make it more beautiful, to remind you on something, to promote... are you all idiots?" .. yes I become quite out of nerves