The Informant
I went to address a disturbance at a barbecue, but when I got there, it was just a bunch of gypsies. While I was walking around, a man approached me and said he was an informant for the FBI and if I left, he would give me some important information.
Thinking he was lying I continued on my way and only left when I noticed everything was okay. When I got back to the station, I received a call from an FBI field officer, who wanted to know everything his informant told me.