Thats funny!! Placebo effect is real - Ive felt dodgy driving after 0% alcoholic beers and felt hungover later also. Watched one guy (a smoker) get 'off his face' on rolling tobacco as its was suggested it was more exotic than a rollie (one chap was being given lumps of peat briquette by his 'dealer' and thought it was the best ever 'cause thats what he was told). Conversely I have often seen someone complain that they were in pain after pain relief but couldnt feel being jabbed in the foot with a pen and then some in agony being cured after some saline....mind is a funny thing!
If you suggested to some people in Oriel that at some point they'd have been drinking Carlsberg instead of Harp they'd have freaked out, full stereotype stuff. funny then when one night it was claimed 'Best pints of Harp by far' though Harp had run out and I stuck on some Carlsberg kegs instead. Twas years ago!! So on yer last point, if someone is the type to fight after drink they will fight if they thought they were drinking too lol