Very specific
This was indeed very specific, to say the least, someone really put a lot of effort into the wording on this sign. Did some similar experience happen to them or someone they knew or loved? We have to admit that it takes quite the imagination to come up with this scenario involving a lion.
Not only a lion though, but sandpaper and pork chop underwear. One can only assume that they mean that the lion would definitely eat you in a brutal manner, just like what they would do to you if you crossed this fence. The image created here is very clear to us, we will happily stay on the other side.