Steve Harley (Cockney Rebel, Come Up and See Me) once played a gig where the audience would be across a small lake from the stage. He arranged for a walkway in transparent plastic to be constructed about 2" below the surface so he could walk across to the audience - never a shrinking violet, Steve!

Unfortunately, by the time of the gig, the hot weather had driven many of the crowd into the lake and they were all sitting on his plastic walkway, spoiling the effect.