I must have had many, tiny biscuit crumbs in my jacket pocket. I also, unexpectedly, had a pen in the same pocket, not any old pen, but one of those with 4 separate colours and you click down on the colour you want.
I took the pen out of my pocket to add something to my shopping list - feeling SO organised, look at me with a 4-colour pen in my pocket - clicked on a colour and out cascaded a stream of tiny tiny crumbs.
Really never expected it!