This is as followed after the steps of finding all UFOs, empowering all nodes and re-configuring the signal strength.
Activate all Scientist protocols, find and enter all warps (yellow X's) and you'll be teleported to Area 51. From here, there'll be 2 lefts, 5 rights and a straight turn and there is a generator room (you'll fight aliens on the way) and you shoot all circuits as followed: 2, 4, 8, 3, 7, 1, 6, 5. After this, ALL power will shutdown and steam will be rising and the room gets all smokey, you then see about 7 green dotted lights and two red circular lines above and beneath them. Walk towards them and press Triangle/ Y and you'll hear f*ck loads of mechanical noises, hold R2/RT and as you get further outside, you'll realize that you're in a UFO. You then are automatically put through a warp, and you're back in Los Santos, in A f*ckING UFO. Hold L1/ whatever to get your weapon wheel up, down by the parachute emblem will be a jet-pack. The UFO fires beams but only destroys cars, everyone in Los Santos freaks out, you start hearing about it on the new and on the TV. There is way more to the Easter egg than this, find out the rest. Also, this has be done by Trevor and can only be saved in his airfield. Just outside of Trevor's garage is a floating jet-pack too.
You phone Tanisha on Franklin's telephone, turns out she works at Area 51. After a couple of flirty lines and doing a couple more jobs for her (this time mowing the lawn), she finally tells you the misty secret and glorious ending to the puzzle:
'You’re an insane, degenerate piece of filth, and you deserve to die.'
Tanisha has a little laugh and then really tells you the last piece of the cracked egg: Put it back together again.
She then laughs, snorts a line of cocaine with her husband, gets in her car, laughs at you and sticks her middle finger out of the window.
Edit: I think there's another part too, let me see if I can find it somewhere. Thanks, keep me posted.
Edit: Found it! You go over to Michael's house, smack him on the bum and tell him that you have found the cracked glorious egg, he then laughs, kills Trevor and goes mental. Michael is Krazy 8. Can you not see? It's all to do with the time setting. Michael is motherf*cking Krazy 8.