- 2007 September 5, Randall Munroe, "With Apologies to Robert Frost" [1], xkcd.com
- And should we write it all again, / I'd end it with / A close-paren.
- 2012 May 7, Randall Munroe, “Every Major’s Terrible” [2], xkcd.com
- CS will make each day a quest to find a missing close-paren.