well I did it in the works canteen, let a small one out only to feel a "bubble" and to my horror I guessed what had happened, all my workmates around me new nothing , I took my jacket off and when I stood up to leave tied the arms round me waist to hide the stain in my trousers, when I stood up to my horror there was a long brown streak on the vinyl seat base!!!
tucked the seat back in and got the hell out of there!!

steve