Pedants arise!
"In some cases your nearest exit may be behind you."
This is a tautology. The phrase "may be" defines uncertainty; the phrase "In some cases" therefore adds no content.
And, if I'm comfortably ensconced in the first few rows of a 747, the ONLY exit would be behind me.
(This also becomes interesting in the new BA business class. If I'm in a seat facing the back of the plane, is the exit toward the front of the plane behind me?)
Best regards,
Wideman