20. Find a leak with Kool-Aid
If you feel like your toilet is leaking you can use this simply trick to find out if you are right. Open the lid of the water tank on your toilet and pour a pack of Kool-Aid in the water.
After 20-30 minutes of not using the toilet you can check the water in the toilet bowl. If it has the same color as the Kool-Aid you know that you have to get a leak fixed.