The event unfolded - a remarkable edited response to laughable situation no.1: created by Mark McGowan:

http://www.youtube.com/watch?v=BeUmuQPHWAE

Fountainhead(s) of Laughter have been appearing spontaneously in SE15 over the last 4 weeks.

"Entering the tent was weird and wonderful", Margaret Wood of 88 Rire Drive recounts, "It was totally unexpected and as for the strange voices I was gobsmacked".
Members of the public, street dwellers, walkers, workers and passersby will have a unique opportunity to experience further "Fountainhead(s) of Laughter", at locations yet to be concealed.

Another response:
http://www.youtube.com/watch?v=acSC5eXAmAY