Clever beer mat

Belgium beer manufacturer Jupiler, together with advertising agency TCC from Breda, the Netherlands, designed a refreshing smart solution: the Refilltje (Refiller, a word play on the word viltje which is Dutch/Belgian for beer mat). The Refilltje is a normal beer mat with a small ridge which fits over the beer glass. If your glass is empty you can slide the mat on the glass so that the waiter can see you are ready for a refill. This will eliminate the wait. The cleverest ideas fit onto a beer mat (English expression: back of an envelope). In this case the mat itself is the clever idea.