for me, the humour came from the absurdity of the situation, coupled with a ridiculous catchphrase shouted mid-stream

( leningrad, Thu 20 Sep 2007, 19:33, archived)

the catchphrase was funny in a Day Today absurdity type way
but the fact that it was real quashed any humour I could find in it.
( HappyToast sorted on, Thu 20 Sep 2007, 19:38, archived)