A River Themes is a drink usually made at the end of the night where, those left standing/sober gather all the
alcohol they can find that is left and mix it together, generally giving the final product a dark murky look, hence the name, river themes.
It generally tastes disgusting, but hopefully by this time of night you wont be feeling it.
There is almost certainly an extremely high
alcohol content, and it should get you very
drunk very quickly. If it does not, then you have made the drink incorrectly.
Last night, we were vagely sober and so mixed cider,
beer, whisky, WKD and some
rum to make a high-content River Themes. This always seems a good idea
late at night.