An inoffensive bomb for a prank

And is methane bomb but only work if you have a can that have a lid of can if be of plastic it won't work, why people don't like the tin lid a can that is that way is useful even to do some camp cooking, or to you cook something like a canning see you can put food and cook and if be well done have food that will be saved for a year, so continuing the bomb and is that way, you pick a can that is something that the person use like powdered milk and put fruit and vegetable peelings and hide the time enough to them produce gas methane, is pretty inoffensive, I was got in that prank I was looking for milk I like milk with coffee, I was so worried that I didn’t notice the suspect weight of the can was very full the lid fly away and have a bang (estampido), the normal is don’t even smell bad only fruit and vegetable peelings isn’t enough to have a spoilt smell. And another joke from my city is the eggs spoilt, and is that way you have to think in the fact a week before and people that use those eggs in someone birthday said that work, so one week before the birthday you shake the eggs and bury the eggs till the date one week after and you would have perfect spoilt eggs to throw in someone is something that you only do in people that you really like, is something for very popular people, who want to be that popular? Rute Bezerra de Menezes Gondim