I agree with dspguy... a thingie from the undersink drain hardware. Although... looks like red stain on the top. Maybe I've been watching too much CSI. Have you or any passengers had any orthopedic surgery lately?
Hmm... This is the first time I saw this thread. I don't see a photo of the thingie and half the avatars are missing from the posts. Did something get fried?
It's the upgrade to PriusChat that happened last night. Fear not, all will be well. Our beloved Danny is getting things all back online... and, I'm sure that the image that has sparked this thread will return.