Pick Up the Phone Booth and Aisle
by David Dyte, Steve Bernard, Dan Shiovitz profile, Iain Merrick, Liza Daly profile, John Cater, Ola Sverre Bauge, J. Robinson Wheeler profile, Jon Blask profile, Dan Schmidt profile, Stephen Granade profile, Rob Noyes, and Emily Short profile
The definition of well-implemented. A beautifully simple game in which just about anything you can think of will have a witty response. As someone deeply interested in the intricacies of what can be done with a parser, it fascinates me.
Besides, it's a lot of fun.