Mystery Solved!

 Remember this post? Turns out they are NOT squirrel spy cameras, but instead are passion fruit. I actually saw a flower on the vine today, very similar to this one, only white.

I nicked one (it was on the sidewalk!) and cut it open--the smell was heavenly!

 Random heart!

I didn't eat it--I have a problem with ooey-gooey slimy textures, so this was not for me. But it's quite cool!