Cruise Ship

The cruise ship White Diamond has a severe engine misalignment, and it wobbles in timespace.
On its last voyage past Cuba, it wobbled slightly and smashed into its duplicate in a parallel dimension.
Counting survivors, casualties, and the missing isn’t easy when life rafts and bodies float between worlds.
Customs wants to make “twinned” survivors fill out Entry Forms.
Apparently, some nutball in Congress got taxing dimension-travelers attached to a bill a while back, and it got approved.
Problem is, we can’t tell who is a native and who is a twin.
“It’s government,” grumble the captains. “Tax them all.”