Pepsi Lemon is really good.
Pepsi Lemon according to Wikipedia:
Pepsi Twist is a lemon flavored cola, marketed by PepsiCo as an alternative to regular Pepsi. Pepsi Twist was introduced in the United States July 12, 2000 and again June 12, 2001. Pepsi Twist made a brief return in the Summer of 2008 with the NFL Kickoff Limited Edition Flavor, which boasted that it was Pepsi "with a kick of Lemon." Pepsi had previously produced a lemon-flavored diet cola in the 1970s and 1980s in the United States called Pepsi Light.
Pepsi Twist was advertised during Super Bowl 2003, with Ozzy, Jack, and Kelly Osbourne appearing in the commercial, along with Florence Henderson and Donny and Marie Osmond. It was also endorsed by pop singer Britney Spears in 2002 and 2003 as part of her contract with the company; it also appeared in a promotion with Austin Powers in Goldmember.
Pepsi Twist appears to be no longer actively marketed and does not appear on the list of brands on Pepsi's official website. Pepsi Twist production was ended in the U.S. during the summer of 2006. In 2008, the product was very briefly re-introduced for the beginning of the on coming football season, but was in very short supply.