Reminds me of when I was like 13 and learned about CRC codes for the first time. Infinite compression here we come! Just calculate the 32bit CRC code for say 64 bits, transmit the CRC, then on the other hand just loop over all possible 64 bit numbers until you got the same CRC. So brilliant! Why wasn't this already used?!

Of course, the downsides became apparent once the euphoria had faded.