I tend to trust all manner of people with all manner of things. But there's only one person I'd tell everything to.

Personally I've found you can trust almost everyone, but you do always get that smiling bastard who hangs around after dark, waiting to greet you up close and then stick a sharp whatever in your kidney.

Deception can be a damned fine method of attack, and there are some pretty weird people out there. The main thing's to go with your gut or to be very careful if you're the type whose gut instinct is always wrong.