I always wonder who picked out the jewelry/accessories that a character wears constantly and just how random the decision was. (eg: Amy's initial necklace and her headband, Scully's cross, Monica's silver ring and earring set, Dani's sunglasses.)
One particular accessory that I find myself wondering about are engagement rings and how much thought goes into picking one.
John and Aeryn, Farscape.
Rory and Amy, Doctor Who
Chuck and Sarah, Chuck
Lois and Clark, Smallville
Desmond and Penny, LOST
Obviously not enough thought was put into picking this monstrosity. Hahaha...