Examples:

• To suggest survey for a minute disease is like killing a fly with an elephant gun.
• Look, you've got some money issues, sure, but filing for bankruptcy would be killing a fly with an elephant gun. Don't stop doing something you love merely because it makes someone angry for no reason; it is like killing a fly with an elephant gun.
• To stop playing games after getting a minor hurt in the leg is like killing a fly with an elephant gun.
• Doctors often prescribe antibiotics even for minor ailments. They’re trying to kill a fly with an elephant gun.
• The authorities cancelled the programme merely for misbehaviour of an individual; they seemed to kill a fly with an elephant gun.