This is one of my favorite episodes! It had a nice blend of comedy and a hint of drama.
The comedy came from the blackout itself. They had to resort to fun games to entertain themselves. They each revealed the strangest place they had sex. It was fun to watch them interact under different circumstances, but still stay the same (if that makes sense!)
Another great piece was Chandler in the ATM vestibule with Jill Goodacre. His "gum would be perfection" was hilarious! It was neat how at the end they came to enjoy each other's presence in the blackout, and were less-than-thrilled that the power came back on.
The drama came in the form of the Ross, Rachel, and Paulo triangle. Ross was about to reveal his feelings for Rachel, until Paulo foiled his plans. It was saddening to see Ross get so close but to get pushed aside.
Overall, a fantastic episode!