Did a bit of simulated caving and amusement arcade soft cuddly toy grabbing thingy a little while ago. My daughter's boyfriend had dropped the air-conditioning valve cap inside his car's engine bay.
Out with some tools and a torch to look for the little bl*****r! Finally found it hiding and tried to reach it with my grabber. Just like those soft toy game machines ,when you think you have got it slips from your grasp !

. The search was on again! This time I crawled underneath the car to loosen the undertray.
I found it ! And again it slipped from the grabber before I could reach it. I went round to the other side of the car and crawled underneath to remove some more bolts. Finally the undertray was loose, but I was stuck! Ears tend to act like the barbs on an arrow. They allow movement in one direction but not in the other.
After some wriggling I managed to reach the valve cap and extricate myself from underneath the car.
Fitted the valve cap and then bolted the undertray back up.