Ken sent me

Ken sent me is the password needed to get into the pimp's room in Lefty's Lounge. “Ken” refers to Sierra On-Line co-founder Ken Williams. In the original AGI game, the player must type the password. In the SCI and Reloaded remakes, “Ken sent me” is written down on a piece of paper which Larry gives to the pimp.

Leisure Suit Larry 1 (SCI)
“Ken sent me.”

Leisure Suit Larry: Reloaded
You've scrawled “Ken Sent Me” in blood on a piece of tissue. And if there's one thing women love, it's a guy who walks around with bloody toilet paper in his pocket.