This is an ESA Rosetta Navcam image of comet 67P/C-G taken on Feb 3 2015.
It may be just a trick of the light, so to speak :-), but from this perspective it sure looks like something popped, …well it does to me at least.
The current view is that the lobed shape of this and other comets is a product of ‘binary contact’ but this view of the comet seems more indicative of separation than evidence of a contact event.
Picture: Copyright: ESA/Rosetta/NAVCAM, CC BY-SA IGO 3.0
licensed under a Creative Commons Attribution-ShareAlike 3.0 IGO License.