IN: What happens next?

How to clean drains
Treat your drain with white vinegar, baking soda, and hot water.
This can help eliminate odors caused by the buildup of bacteria, grease, and organic residue in your drain. It can also help clean out residue to prevent a future clog.

OUT: Pour of a cup (118 ml) of baking soda down your drain, followed by a cup (118 ml) of white vinegar. Cover or plug the drain immediately and let the mixture sit for about 15 minutes.

IN: What happens next?

How to get deleted files back from usb or hard drive
Stop using the drive. The data is not essentially destroyed.
The pointers have been removed and the data is waiting to be overwritten.

OUT: The chances of recovering the files you want go down significantly if you keep accessing the drive you are trying to recover from. Adding and removing more data can corrupt the data of the files you are trying to recover from.

IN: What happens next?

How to handle a cat that suddenly attacks you
Act calmly.
Reacting strongly can increase the cat's stress and interest in attacking you. It may even make the cat's prey instinct kick in more, spurring it on to bite down harder.

OUT:
Instead, stop moving and reacting to the cat. This will take away all the fun the cat gets from the attack.