Be careful crossing the street. Look both ways. Twice.
Good advice from parents to children. Good habit for adults, and not limited to crossing streets.
One quick look is often not enough. What’s moving in the grass? Where’s the hamster? (or kitten, or puppy, or other pet) Is the mess cleaned up? The stain removed? Often a careful examination now will save time and effort in the future.
And sometimes people play tricks on others.
For example:
Taking a nap on these rocks would be comfy.
Reason: They’re pillows.