Ed Helms and Christina Applegate, well-known comedy actors posing in a fake marriage, were trying to protect their two fake sons from a fake tsunami.
The quartet, joined by Charlie Day as a volatile fake river-rafting guide, were in a boat here one morning last fall at a small water park. They were contemplating how they'd gotten themselves into this vacation situation and, more important, how they'd get themselves out.
A portable geyser doused them with water. A raft rocked angrily as burly men pulled on wires to tame it. Oars and other navigation devices were as absent as a Rand McNally map at a Google convention.
"You're our only hope," Helms wailed to...