I alway believe that after drinking an excessive amount of alcohol, anyone will show you their true selves and who they really are, whether you are a pissant, very friendly or a total cocksucker.
After couple pints of guinness and few cosmos, I'd get very friendy and I hug people a lot. I smile a lot, too.
In other times if somebody pisses me off, i'd play mind games with them cuz i have a honest face, they'd believe in anything i say. Then I laugh at them.