Certain blocks will play their breaking sounds and particles if you break a dependent support block (instead of that block itself). This includes:

• Tall/double tallgrass (but not flowers)
• Vines, but not ladders, buttons or torches
• Double blocks (doors, double tallgrass, beds etc). If you break one half of a double block, it will play breaking sounds for the other half as well, causing the sound to appear to play twice.