I am so sorry to hear that and I can imagine your baby being scared of that awful noise. If you have not already done so, you may want to totally put the jar out of his sight.
If my Romeo does something he should not, I simply tell him no and walk away. I give him about 10 minutes before going back to check and I can tell he got the message because he has those "sad, sorrowful, I am sorry, eyes".
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Romeo  and Sujata 
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