How can you make an explosion

OK, so, for all of you future science fair people out there, wouldn't you love to know how to make things explode? After all, we can't leave all of the explosions to science fair nerds, can we ? (JK, I think science fair people are cool)

1) My friend and I found out this way by just messing around with stuff (Tee-hee) Okay, so first, get an empty liter bottle that once had some sorta soda in it, and put baking soda and vinegar inside. Then shake it up and let da fun begin !
2) Mentos in Coke. This is a classic way to make something explode. Although, I'm not sure wether or not this works, I've never tried it. But why don't your be the guinea pig and do it for us ?!
     we thank you kindly
3) Go to Hawaii and see a volcano explode ! Because I've got to be honest, I'm all out of ways of household explosions (: BTW, these explosions are great for science fairs ! But please, refrain from doing it on the inside, and do it in your driveway. ( =