Do you know what the first beer would've been like?
From my recollection, it would've been a darker, hoppy beer. Not like an IPA, sweeter than that... but, I haven't had one...
Why was it invented? Do you think it was made by people who were looking to get drunk?
I'm pretty sure it was an accident. Once you find out that yeast can metabolize sugar into alcohol, you're going to stumble onto it. Yeast also carbonates: the gas it gives off not only gives beer and champagne their bubbles, but makes bread rise, and I'm pretty sure it gives Swiss cheese its Swiss cheesiness.
Do you think it affected people the same way back then?
Pretty much, yes.