Diego’s Aliensssss!.wav reminds me of the scene from the first Alien film when the crew from the Nostromo discovers the egg chamber. In that scene, a crewmember discovers a leathery egg, which slowly opens from the top like a blooming flower. The sloshing noises are reminiscent of the noises made when the camera pans closer to the internals of the egg, settling just outside of the opening. Just as there is an apparent calming in those noises, the alien inside of the egg leaps out at the astronaut.
This sound would likely be diegetic, but its usage would depend fully upon the mise en scène. What I would be planning would be more of a home scene, where two people are debating on what film they should watch after a long week at work. As one of them flips through the channels with a remote control, sounds emanate from the television that correspond to each channel. A good way of indicating this action would be to have a “white-noise” sort of sound between memorable movie sounds while one of the people announces movie titles to another.
This Alien noise would represent one of the channels, between the sounds of white noise in the clip, that would indicate some kind of sci-fi channel. Other sounds would probably be a noise like fire, for a cooking show or maybe something about camping, sounds of a rocket taking off for a “Discovery” like channel, or the sound of animals fighting for an “Animal Planet” like program. The sound of a button clicking would represent the mechanical press of the remote control.
If this were some sort of skit, I would like to anchor it in a time-period with lots of sounds and a musical choice that cements it firmly in the 80’s. The static sound would be reminiscent of the noise made by an analogue television, and the clicking would be a reminder of the thick, solid remote controls of that time period. All of the movie and show choices should be from that time as well.