I think It would be nice to share unforgetable moments in Lost
The first one came to my mind is the first Desmond-Widmore conversation. Desmonds eyes and eyebrows after Widmore humiliated him.
When John Locke was crying-screaming on the hatch the light turned on. His voice has never gone away from my ears ( I have done everything you wanted me to do, damn it ! Why did you do this to me !!!! )
When Jack learnt that Claire is his sister.
What have you not forgotten ??