hobo trap

A device or tactic used by hobos to solicit or obtain handouts from unwitting passers-by. These traps are often designed to take advantage of someone who is in a vulnerable situation, locals or other hobos, which is a direct violation of rule 3 of the hobo ethical code. Traps may occasionally be marked with hobo signs designed to covertly communicate trap effectiveness with other hobos.

I barely escaped that hobo trap back there with my wallet.

Why is there an unopened champagne bottle by that bush? That's a hobo trap.