Give away money for the wedding - pack in bottle caps
No diligence, no price. Give away money with a whistle - wrap money in bottle caps.
Such actions can be remembered even after years, and even laugh again and again. Is another wedding in the circle of acquaintances in sight? Or a round birthday?
Not everywhere you know the custom, bridal couple or anniversary bottle caps to sweep. The Feaueaueigkeit increases immensely, if you stick the present in some of the bottle caps, namely cash.
So collect, collect, collect, eventually enough caps are there for such an action.