You shouldn't cat-call people.
Liam sees a pretty girl waiting in line at the ice cream shop.
Liam wants to talk to the pretty girl.
Liam asks the girl what her favorite ice cream is.
Liam walks by the girl, yelling out sexually inappropriate innuendos.
The two bond over their favorite ice cream flavors and both have made a new friend.
The girl is thoroughly afraid and embarassed, and steps out of line to leave.