Ever since I saw the youtube videos go viral years ago, I’ve been wanted to do this. Now its even better. I’ve got two kids to enjoy it with! If you’ve never tried this, its definitely worth the couple of dollars for an off brand diet soda and a package of mentos. The most inexpensive grin you will ever receive from a three year old, me too as well. The gusher went at least 15 to 20 feet high and latest about 6 seconds. Just seven mentos does the trick and they were mint flavored, not sure if that matters. The best part is once it simmers down just dump the excess soda and enjoy a handful of mentos. Give it a try sometime, let me know how it goes!