New pet in the car!

Just as I walked past my B4 in the back, I noticed that a parlor fly is turning its rounds inside the flasher housing. I thought it had come into the frame of the bulb for the flasher, but found out that there is still a translucent plastic housing behind it. Now my questions: 1. How did this stupid animal get in there? 2. How can I get it out of there without expanding my blinker? (My blinker is not a terrarium! )