Money

Actual proof like seeing one. I'll believe in/acknowledge aliens if or when they're confirmed. I think it should be treated the same way we treat all other species or hypothetical species. If its existence is proven, we acknowledge it. If not, we don't. I don't want to believe things. I want to know things, especially when it comes to whether something exists or not. A species either exists or it doesn't. Aliens haven't been proven. Therefore, I don't acknowledge/believe in them. If they get confirmed, I'll acknowledge them.

Nothing. I do believe aliens exist. I don’t believe they come down to our shitty little planet every weekend and shove a probe up Cleetus’s arse though. They’ve got far more interesting things to be getting along with.

Seeing

I think they absolutely exist somewhere, the question is are they HERE, and are we able to perceive and communicate with them... I suppose when somebody posts their Tiktok of Zorblaz the Annihilator playing with a cat

A rectal probe

I already do. Anyone who doesn't is way too closed-minded or just hasn't been paying attention.

A six part series on BBC2 presented by Professor Brian Cox.

I already do. E.T and ALF are totally real and the Stan Romanek documentary was dumb but convincing. He is now a registered sex offender so do what you will with that info.

An episode of Alf.

Dawg you're not alone in this vast universe.

Nothing. It takes nothing to think they exist. In the tiny space we can detect we so far found more than 4400 planets. This gives a potential number of planets in the Milky Way of many, many billions. And there are many billions of other galaxies around us. From the number of planets it is highly likely that many, many alien lifeforms exist. But for me the most alien of aliens are some other people. So in any possible meaning of "alien" I think they are out there and down here.

An alien