Marvel Tales #153

Oil barons from Mercury are looking for places to drill in Texas when an Earthling picks up their thought transmissions and thinks he's developed telepathy. He stows away on their craft to get in on their claim. He doesn't know that their craft has returned to Mercury, so when he disembarks, he tries to rabble rouse the locals against the aliens. When they don't respond, he realizes that he is not telepathic. All Mecurians project their thoughts, and he is on another planet.