My only bubble joke is:
There were three ducks swimming in a pond one night after midnight and got arrested for trespassing.
They were called to appear in court the next day so the judge called up duck #1 and asked 'what were you doing in a pond swmimming after midnight?'
The duck said "blowing bubbles."
So then the judge called up duck #2 and asked the same question and the duck said "blowing bubbles".
Then the judge called up duck #3 and said "let me guess - you were blowing bubbles too" and the duck said, "No, your honour, I am Bubbles."