If UFO's aren't aliens, and aren't hoaxes, what's the scariest scenario for what they really are?

Source.

Just view my photo to find out

Apes! They were just pretending to be non intelligent to fool humans.

@Lee4000: Dolphins & Whales.. Now those, politically correct, " non fish, mammals " Those we have to worry about. After all - what are they saying about us... ? All the songs & aquatic concerts...

Hhaaa.

Drones...

@B3dR00m3y3z: ugh.. Your not talking about the Queen's little sex slaves are you? LOL

@Zilya777: By queen you mean Obama and by sex toys spying on us and possibly even weaponized for when it suits him than yes. Lol

@B3dR00m3y3z: hhhhaaaa... Great minds think alike. :-)

Alot of "UFOs" turned out to be the Stealth bomber in its early stages of development....but I love the "Planet of the Apes" angle lol

The sheer size of the cosmos is unthinkable. So theres a 100% chance of intelligent life elsewhere. The chances of them finding is without is finding them...eh. "light travel" is something around like 32k miles fast or something. For us to get to the nearest star at that speed is 7 years. Not taking into account time gettig to that speed. Along with deceleration and accelleration for potential collisions. Any faster breaks OUR laws of phisics. With that said. Chances are small we've seeen lagitamate "aliens". The chance is always there though.

As for a scenario. Seeding earth? Naw..anal probes? I just lol @ that. Recon..plausible. invasion. Not likely. Woulda happend ages ago before we had firepower. So..ya my thoughts.