Lets see now
Hello 3 (Halo 3, iunno it sounds the same if you say it fast enough)
Guitar Harmonicie (Banjo Kazooie...erm...kinda self explanitory)
Call of Doodie 4: Toilet Warfare (COD4, so juvenile, i love it)
Not So Final Fantasy (Final Fantasy series)
Devil May Care (Devil May Cry Series, you know like the saying's supposed to be)
Legend of Helga (Legend of Zelda...but with a big fat dutch girl named Helga)
Polk Band (Rock Band with Polka music...How can that not be awesome?)
Tambourine Hero (Guitar Hero...Heeey mister Tambourine man, play a song for me)
Ass Effect (Mass Effect if it were made into a cheezy porno)
Jesus Chrisis (Crisis, except with Jesus)
Ninja Garden (Ninja Gaiden, This time Ryu gets to plant Tomatoes!)
Exponential Decay 1, 2 Episode 1 and 2 (Half-Life 1, 2, Episode 1 and 2...well what did you think a Half-Life related to?)
Some are lame, I know these are the first ones that came to me...