Delta
Delta isn't known for great customer service, but the company does have quite a nice logo. This logo forms the Delta symbol, which is also the fourth letter in the Greek alphabet. The colors are the ones always used by the airline. It's not especially subliminal or crazy, but it's still a good reference to something only linguistics lovers will understand!
Pittsburgh Zoo & PPG Aquarium
The Pittsburgh Zoo and Aquarium decided to go all-in on their logo, and it really paid off for the locations. When visitors see this logo, they might think they're looking at a tree in front of a fish pond, but look just a moment longer and they'll see a gorilla staring into the face of a lion. Hopefully, those two animals don't ever have to actually meet in real life...