I've found a weard interaction, as described above and ilustrated below.
As artifact Bayou (non-creature) touches de grave, it triggers Bridge from Below. I might be missing something, but I don't think so:
1. Activate Liquimetal Coating targeting opponent's Bayou.
2. Activate + ability of Karn, The Great Creator tageting Bayou.
3. When Bayou was put into opponent's graveyard, it trigged his Bridge from below (make a zombie).