Two would-be robbers in the US failed to measure up when they were outsized during a hold up in Seattle at the weekend.
The men went to a shop on Saturday night and pointed a gun at the clerk, demanding money, police said.
But the shop worker recognised the guns the men had were fake and whipped his own gun out, telling the pair his was "bigger", local news reported.
The two men fled the shop and raced away in a getaway car. Police have yet to track them down.