The Constitution actually forbids arresting Congresscritters involved in their duties.
Right you are! Well, then, I suggest an improvement on my suggestion above.
Instead of having the balloons merely inflate and float to the ceiling, don't close off the fill-neck. Just let them loose so that they rise a little and then race around randomly deflating and making "fart" noises. Hilarity ensues.
 I'm undecided whether that scenario is best done all at once, or sequentially, to extend the duration of the noise.... Opinions welcome.....
“The Constitution actually forbids arresting Congresscritters involved in their duties.”
When was the last time Washington adhered to the Constitution when it did not agree with their plans?
In my best Alfonso Bedoya impression:
“Constitution? We don’t need no stinking Constitution”