The idea is that you brief anyone else in the ac (or yourself if you feel the need...) on the forthcoming takeoff and any emergencies... e.g. (a long version):
'This will be a standard shortfield takeoff with 15 deg flap selected. I will hold the ac on the brakes, apply full power and confirm 2300 rpm before releasing the brakes. Rotation will be at 55kts for a climb speed of 65kts.
In the event of a problem on the runway I will close the throttle and brake. In the event of engine failure after takeoff if there is sufficient runway available I will land back on; if not, I will choose a field within 30 degrees of the nose and land there. I will ask you to open the door and wedge it with a shoe, then adopt the brace position until we come to a standstill. [In the event of engine failure above 500ft I will attempt to land back on the airfield.]*
Any questions?'
*this bit is controversial but the RAF do include this in the standard Tutor takeoff brief, though I couldn't swear to the height (e.g. could be 600 or 700).
Tim