Why is my socket making a buzzing noise ??

I was checking to see if my spray bottle was working and randomly sprayed it and it sprayed onto the wall above the socket and started to drip down and my socket is a bit loose and not properly on the wall and I didn’t check to see if it dripped down into it or dried before it could but I was going to charge my... show more I was checking to see if my spray bottle was working and randomly sprayed it and it sprayed onto the wall above the socket and started to drip down and my socket is a bit loose and not properly on the wall and I didn’t check to see if it dripped down into it or dried before it could but I was going to charge my phone there and I was using an old plug I found in my house and all of a sudden I heard a buzzing noise and I don’t know if it was coming from the socket or my plug but I took out the plug and turned off my socket anyway. What one do you think was making the noise and is it dangerous could the house go on fire or something ??
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