How to be a winner or an alpha male?

How can I politely "word" a winner takes all game. Where you put money in, guess how much, winner takes all?

• I am planning for a birthday party and want to put a bin at the door for donations to the child's piggy bank. I want to put up a sign so people know how it works, but I don't know how to politely word it. I want it to say, 1. put money in, 2. guess how much will be in the bin by the end of the party, 3. winner takes ALL, (Just a little extra explanation) The winner will receive All laundry detergent and the money will go to the child's piggy bank. Any help would be wonderful.

• Answer:

  I don't know, the way you worded it sounds pretty clever to me. Maybe you could print out (or cut out) an ALL logo and tape it on the sign as well as put the bottle right next to the sign and piggy bank so it's more obvious that they're not getting any money, just the detergent.