acquired two bubble machines as part of my MA final project performance - and they were used to "set the stage for comedy" by creating a world of bubbles at the beginning of the stage piece through which the clown entered (and eventually exited)
I have used them since, I one thing I do is chase them with a butterfly net and try to catch them to give them to kids. (haven't succeeded yet)
Another is to try to walk through the bubbles as if they are a mine field and not pop any. (never happens)
still looking for more good ideees though too .....