open source projects should have anti-acknowledgments, e.g. "project is kept maintained despite the best efforts of the xenophobe [name] that kept harassing the lead developers"
@whitequark reminds me of the "Anti-Foreward" written by Dennis Ritchie, which the authors of "The UNIX Hater's Handbook" later confessed was the best part
(The whole thing is now free, Ritchie's section is PDF pages 37-38)