Redstone torches may play burnout effect if placed on top of redstone block.
Burnout effect happens when a torch turns on and of a lot of times in a small ammount of time, but in that case if you place a torch on top of the block and then break it several times and fast, it never turns on, but it will play the effect (Sound, and cloud).
It is a visual and sound bug. 

Video showcase: https://youtu.be/ohllyaJE5ts