When a loved one dies from something related to lifestyle, then one is allowed a little preaching. I believe it with regard to smoking, drinking, and even bad diet. With that, I'll proudly say that you should put down that crap you're eating and take the stairs every now and then. It might be rude, but if my soapbox keeps someone else from dying like my father did then I don't care. Give the OP a break and try not to light up in front of him.

In college (>10 years ago) I had an internship writing hand scanner software for a large alcoholic beverage distributor. Since it had to be functional with all their products I made it so that if an obscure 7oz. drink was scanned the operator had to play a hardcoded game of ascii Space Invaders to continue. In the end I chickened out and took out the conditional, but I'm pretty sure I left the actual game in the source code. I've always wondered if whoever took over after I left noticed it. I wish I'd have left it in, or at least a short demo, as an Easter Egg.

I use GNU Octave. I'm a grad student in Discrete Mathematics and Octave's ability to read my MATLAB code lets me work from home and test out light algorithms without the mess of SSH-ing into my server at the office. It's been great.