This CFI and his Student are holding on the runway for departing cross traffic when suddenly a deer runs out of the nearby woods, stops in the middle of the runway, and just stands there looking at them.
Tower: Cessna 123 cleared for take-off.
Std: What should I do? What should I do?
Inst: What do you think you should do?
Std: Maybe if I taxi toward him it'll scare him away.
Inst: That's a good idea.
(Taxi toward deer, but deer is macho, and holds position.)
Tower: Cessna 123 cleared for take-off, runway 12.
Std: What should I do? What should I do?
Inst: What do you think you should do?
Std: Maybe I should tell the tower.
Inst: That's a good idea.
Std: Cessna 123, uh, there's a deer down here on the runway.
(long pause)
Tower: Roger 123, hold your position — Deer on runway 12 cleared for immediate departure.
(Two seconds, and then -- I presume by coincidence -- the deer bolts from the runway, and runs back into the woods.)
Tower: Cessna 123 cleared for departure, runway 12. Caution wake turbulence, departing deer.
(from EDDHde)