I used to make programs on my TI-84 calculator during Pre-Algebra.
I made an interactive "human" where you had a list of stuff you could do to him. Whenever you did something bad, it took 1 away from a variable, and vice versa. Every time you chose an option, it checked the variable, and I had about 10 menus made. When you had the variable high enough, you could hug him, and if it was low enough, you could shoot him. If you choose to shoot him, you can never open the program again unless you reset the variable.