Argh. I can feel this one.

My party often gravitates to the grossest random ad-hoc detail.

"I'm pretty sure that dead animal carcass is magical. I stuff it in my bag."

... Much later ...

"I dump the dead carcass on the Wizards desk and ask him to cast 'detect magic'".

...party proceeds to remind me (the DM) that they've carried a dead animal carcass in a backpack for half the campaign...