Then there are three options available.
1. You and Serah are telling the truth. This means we have a bus driver or our mod smurfed up.
2. Serah is lying. This means she is mafia and something else that just slipped my mind, I'll post it when I remember what it was.
3. You are a big fat phony, and as there is no jester, are trying to get rid of Serah for some reason. Most likely mafia.