The strange noise under the sink

This morning after I brushed my teeth there was this strange noise that seemed to be coming from under the bathroom sink.  I opened the cabinet door and listened.  I had never heard it before and couldn't begin to figure out what it was.  I told Dick that the water pipes under my sink are making a funny noise.  He said maybe there was air in the pipes.  I went to the kitchen to make coffee and forgot about it.  

A while later I went back to the bathroom and there was that noise, still going strong!  I immediately called to Dick to come and listen to this noise right away.  (As you can imagine, I'm hypersensitive to strange noises in water pipes!)   He got up from his comfortable computer chair in the office and came back to the bathroom like a good husband and listened to that noise under the sink.  Even he was completely stumped.  In the process he noticed there was some water collected on the counter top behind my washbowl and asked what that was from.  I was thinking,  "Why does he have to care about that right now?"  What I said was, "It just gets like that sometimes when I wash my hands and stuff."  I grabbed the hand towel to wipe it up, picking up the soft soap dispenser and toothbrush holder as I wiped under them.  

What??  The toothbrush holder was vibrating??  Then I suddenly realized the source of the noise and I said,  "Oh, never mind."  Can you guess??

I had forgotten to turn off my battery operated toothbrush before I put it in the holder.  And that was the source of the  strange noise that seemed to be coming from under the sink!  Wow, talk about feeling stupid and relieved at the same time!

And, like a good husband, Dick just went back to his comfortable computer chair without saying a word.