Effect:
The magician invites the spectator to pick a card and sign it, he then borrows a PET bottle and has it examined.
Then the magician takes both the card and the bottle and whisks a black cloth over them, in less than a second the cloth is whisked off, and the card is inside the bottle.

I don't expect to find something completely the same, but here are some things about the effect I know for sure:
The bottle can be examined after the effect and the spectator takes the card out himself.
The card is hardly bent or anything.
There are no duplicate signatures.

Seems too good to be true...