Two Sides
Riddle: One side hopes you have a great day. The other wishes you'd just go away. One side wants to be its best self. The other just wants back up on the shelf. One side always needs the other, and yet you may require a brother. What is it?
Answer: A battery. One side is positive and the other is negative. Most devices need at least a pair of batteries.
Source: https://www.riddles.com/10825
