Scenario::
You have been fishing/diving all of a long day and are extremely tired. Pull up to the gas station to fuel up. Get in the boat, open the fuel cap which is right next to a rod holder, get out of the boat, get the gas line, put it in the hole which is above your line of sight, you can feel it but not see it, start filling.
Guess what?? Wrong hole.
I've actually done this. Thankfully I had good ears then and it did not sound right, so stopped before any major damage was done.
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