piss like a horse - new record?

Oh dear, I was travelling by car for ages and had to piss the whole time. Normally I like to do this in public. But this time I thought I could try for a new record. I held on to the champagne for as long as I could and already had tears in my eyes. It was a relief to drain this particularly golden bubbly and collect it in a measuring cup for you. The quantity is definitely record-breaking. The stream poured endlessly, I really couldn't stand it for a second longer. How much do you think is in the measuring cup?