Squeeze this toy bag to activate it and it rapidly inflates. Throw it quickly, and within 3-5 seconds it will EXPLODE, emitting a putrid foul fart odor into the air. Pop! These are similar to our toy bomb bags, except the fart bags have a smell in addition to the bang. These babies are loud but harmless, as it is a simple chemical reaction between citric acid & baking soda. Parent approved. If you like the smell of this you will gag for our stink bombs.