You take a match and push it right through the box from one side to the other. You open the matchbox and out on the table falls a large brass plate that completely fills the box...
Bet someone that you can suspend the beer above the table using three knives and three glasses. Each Knife must touch only one glass and the beer can not touch the glasses...
Bet someone that you can move the olive from one coaster to the other, without touching either the olive or the coaster, without skewering the olive, or letting it touch the table...