Let me make some utterly useless suggestions:
1. Take a 4017, some LED's, an opamp of your choice, an electret mic capsule and build a walking LED light that walks a step each time it hears a loud noise.
2. Build a power amp using the TDA2030, add to that an oscillator of some sort (I'm thinking 200-1000Hz sine). Nice loud siren.
3. Combine the two and you get a circuit that shouts back at you each time you shout at it. If you add the ADG508 to switch the frequency setting passive parts in your oscillator you could get a circuit that shouts back at you in increasing pitch.
Might be good for stress relief...or might make you more stressed, what with constantly being shouted at by your work.
4. Get a photodiode/LDR, build a light sensitive oscillator, add the TDA2030 amp I mentioned earlier and hide the whole thing in your other halfs wardrobe. You'll likely get a smack for that
.
4a. Same thing works for toilet seat.
The possibilities are endless...