Bartender's eyes only
Tall Orders. Three cards are taller than the rest. Land on one and everyone stands and sings the whole song standing, spoons held high. Anyone who sits too early hears "Tall order!" and pops back up.
The Doible Shift. They're too tired to spell. Whoever points out the spelling has been noticed, and on this ship, noticed means you sing next.
The numbers. The Archive unlocks cards a few at a time. When this deck came through, 13 had arrived. Then four more showed up. Auditors are still studying the pattern. If you figure it out, keep it to yourself.