Sims obsessing over items?

That stupid lump of clay, I started getting rid of it as soon as I saw it in their inventory. They'd leave their meal sitting on the counter to play with the clay even when their hunger was in the red.

Less annoying, even sometimes charming was their obsession over musical instruments. Once when my sim arrived home just after receiving a job promotion she pulled out the signature guitar she just received as a bonus and started playing while still wearing that weird llama/unicorn mascot costume. Wish I had thought to get pictures and/or video clips of that.