Diabetes Details 4: Embarrassing Pump Mishaps

Help please!  I need a small device I can use to make the "bleep" sound of censored swearing.  I'm hoping to do a reading of "The Creature in Your Neighborhood" at my book launch next week, but there's one scene that wouldn't be appropriate without the bleeping.  Any ideas on a device that might work?

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I debated whether to share this one, but I decided what the heck.  My ego can take it, and everyone can use a laugh on Monday mornings, right?

My insulin pump is a pager-sized device which...