Two-Thirds-Life is an awesome online Flash short made as a parody to the original Half-Life. Looking at each chapter and parodying it, Two Thirds Life manages to be pretty hilarious. A 27-minute sequel which would parody HL2 was in the works until early 2010, when it was cancelled, and all that remains is a trailer and a demo chapter of “A Red Letter Day”.
View on Newgrounds: http://www.newgrounds.com/portal/view/236929
Still, the original is very awesome, and the TTL2 previews are great as well. Perhaps the author, Raiki, can post the unfinished videos. Till then, enjoy this classic.