From mainloop.c, around line 365 or so of version 3.4.7.2:
fprintf(stderr, "How are you gentlemen? All your base are"
" belong to us. (Openbox received signal %d)\n", sig);
Thanks to this Arch thread for pointing it out. 😀
Heh.
I like those little details as well. It makes the software more human in a way.
Similar to this are the so called “easter eggs” you can sometimes find within certain software.
This thread contains some of them: http://ubuntuforums.org/showthread.php?t=762141
I like rgrepping the kernel source for words you can’t say on radio or TV. 🙂