There's been a thread about dependencies lately and the challenge of convincing developers to look at the full dependency chain.

I once maintained a C++ binary that included a PostScript interpreter, a JPEG decoder, a JavaScript interpreter, and a number of other utterly irrelevant pieces causing a huge factor increase in the size of the binary.

The culprit: A single logging statement that invoked a general-purpose printer that could print web stuff. Switching to sprintf fixed it.