I decided to put this here because I have a trailer I use for camping with the scouts. Earlier tonight, I needed to move the trailer and realized I had lost the keys to the trailer coupler lock. It was a masterlock trailer coupler lock that looked like this:
With a single search on YouTube, I found a video that showed how to bypass this lock in 10 seconds. My lock was pretty tight so i had to use a maul to get the prybar in the right place- so it actually took me almost 30 seconds to get this lock off! You read that right- in less than 30 seconds i was able to entirely remove the lock from my trailer without the key using nothing more than a prybar.
LESSON TO BE LEARNED: I can't even call this lock a deterrent to honest people much less to thieves.
:-(