You don't need to say "agree" or anything, if you lay down the rules and the person rolls against you then you're accepting the bet. You cannot back out of it, otherwise anyone could sneeze there way out of it.

You don't need to say "agree" or anything, if you lay down the rules and the person rolls against you then you're accepting the bet. You cannot back out of it, otherwise anyone could sneeze there way out of it.