The 1987 set 4030: Cargo Carrier is easily one of the most meta Lego sets that exists. Here we have a cargo ship with the primary cargo being Lego. A Lego set that is full of more Lego! So meta.
I really enjoy Lego sets that contain references to the product. This is probably one of my favorite ones though since a lot of Lego has to be shipped overseas. The scale of the set isn't too bad, obviously the boat would have to be a lot larger to actually be at a minifigure scale, but it works pretty well regardless.
One has to wonder what the cargo is. Perhaps boxed Lego sets, or maybe just parts that still need to be sorted and boxed up before sold. Or perhaps the men onboard are the actual cargo, and they've escaped! Either way, it's a very nice looking set and one that I would love to own.