not really tech, but i took off my bumper and on the plastic protective things under the car, was an old radiator cap. guy before me must have droped it and said screw it. thats all

 

One time I was like..."Where the hell is my 10mm wrench?"...which I use all the time. I opened my hood is shop class a week later and voila. Whats that wedged between my radiator and the frame? "Yesss! It's my wrench!"

 

I dropped a spark plug socket in my engine bay one time and guess what its still there i can see it.

 

now im kind of curious to what else is in that engine bay