Actually that's not fair, the guerilla campaign created by Duval Guillaume in Brussels for the Overpoort Bowl doesn't have holes in it - rather it is holes. Three of 'em! Stuck as a sticker on any round object it instantly turns helmets or salad heads into bowling balls.
The campaign was played out locally in Ghent, where the bowling alley is. In several pubs in the neighborhood, the toilet sign was replaced with a sign in which the icon held its head as a bowling ball.
And anything with the right round shape - traffic signs, helmets, water melons - got stickered and became a bowling ball.