I think any real professional crew on here are aware that the briefing is probably your last opportunity to formulate an initial plan for an, admittedly unlikely, shockingly violent, noisy and bloody situation.
No matter how often you've flown before, you will almost certainly be sitting in a different place, on a different aircraft type, day or night. Remember there are different developments and cabin layouts of most types.
On the flight deck, we brief every departure and arrival as if it will NOT go according to plan; could be a clue there . . .