The one who denied it supplied it
When you were a child, did you ever make a trail for a sibling or friend to follow by chalking arrows on footpaths, fences, gutters, telegraph poles and other natural canvases? What was at the end of it? A chocolate biscuit on a plate? An unoccupied trampoline? Or did you play the mean trick of having the trail lead the person right back to where they began? Was the final arrow perhaps pointing to a chalked message of - to your childish mind - great significance? What did it say?