You will never see the best shot of this...

... because I wasn't quick enough on the draw. The best shot (IMO), had the old woman just where she was, but with a look of surprise on her face and her hand over her mouth... Aw well, close but no cigar.

Anyway, the context is that this is apparently how the water quality tests are done. The tap is turned on to maximum, a bottle of water is taken, and the tap left running while the engineer runs and records the tests inside his van, just out of shot.