"Hey, wizard, can we talk? I'm a little worried about the thief you've hired for the party."
"Certainly, sir dwarf."
"Are you sure he's a proficient thief?"
"Uh, yeah? He's a Halfling, hello?"
"You've said that, a lot. How well do you know him?
"Well I haven't actually seen him in 40 years, but he was always getting into trouble as a kid. Halfling children like that always grow up crooked."
"So you don't know if he's a thief or not?"
"Of course he is. He's a HALFLING. He's small and sneaky and probably pretty good at stabbing people in the back."
"But you haven't seen him in 4 decades!"
"Look, I knew his grandfather. He once beat a guy to death with a golf club. Hobbits are natural criminals."