It was cloudy with a chance of Prime in Copenhagen on Monday ... 'cause Logan Paul and KSI's meet-up with fans came to an abrupt halt when they started getting rocked with bottles of their own drink line!!
The wild scene went down as the YouTube boxing enemies-turned-business partners were promoting their hydration beverages in Denmark ... when, for some reason, some members of the crowd decided they'd much rather chuck their handouts than consume them.
Now, the whole thing could easily be a publicity stunt to give Prime some free airtime .