Good bets start before anyone picks a side.

“I could definitely do that” is a great start to a conversation. It is not quite a complete bet. The difference is a few small details everyone agrees on before confidence takes over.

Ask a question you can actually answer.

“Sam is good at darts” could keep the group busy all evening. “Sam hits the bullseye in three throws before 9pm” gives everyone the same thing to watch. Put the attempt, deadline and what counts as success into the question or rules.

If you need proof, agree what it should show. An uncut clip of all three throws is much clearer than a photo of the final dart. Evidence should make the result easier to understand, not turn the evening into a courtroom.

Choose a judge before the moment arrives.

Pick someone the group trusts to call the result. In Conjectal, the judge records what happened. The creator can change the judge, so that responsibility should stay visible and understood by everyone involved.

The app does not arbitrate disagreements or enforce promises. If the group cannot agree what a fair result looks like before starting, rewrite the bet—or leave it as a joke.

Keep the unit friendly.

Points, push-ups or making the next round of coffee can all give a prediction a little weight. Choose something everyone involved actually wants to take part in, and keep the amount comfortable. Nobody should need to explain why they would rather sit one out.

Leave room for the story.

The best part might happen before the result: the practice attempt, the overconfident reply, the photo that changes everyone’s mind. Put those updates next to the bet. A clear question gives the group a shared starting point; the conversation makes it worth remembering.