Haha, yeah. I was pretty sure I spotted it at the theaters but just never got around to posting about it. However, watching the DVD at home I noticed you can TOTALLY hear the same sound effect when Bumblebee deals Soundwave his deathblow uppercut (which sprays his parts across Bee's chest plates) and then again when Bee spreads his chest plates open and shakes out the "rings." Kind of a brittle "tinkling" of shattered glass or something like that. So there it is. A corpse wedding ring.