Agreed with the Dangerous Liaisons scene, but the best dialogue/ lines come earlier…
This absolutely crackles.
“Remember…I’m better at this than you are”
“Unless you prefer, if memory serves, this rather purgatorial sofa”
“It is always the best swimmers who drown”
“I will merely confine myself to remarking that a “no” will be regarded as a declaration of war”
And of course…
“Alright…WAR!”