Nature I Calls Calling Pull Car Rest Stop

""Can you pull the car over at a rest stop as soon as you can? Nature calls!"
""I have to go to the restroom. Nature calls."
""That little boy is crossing his legs, nature must be calling."

A. ""I should not have drunk all that water before we got into the car."
B. ""Why? What's wrong?"
A. ""We just left and nature is already calling."

Other Common Sentences

""I need to go to the restroom."
""I need to pee."