“If she’s out here and not locked up in the barracks, I’ll know,” he said. He took a deep breath and whistled.“You share a whistle?” Trevanion said in disbelief.“Do you have a problem with that?” Finnikin asked.“I have a few whistles,” Lucian murmured. “Very confusing sometimes.”“Whistles are meant for combat,” Trevanion said. “Not wooing women. Women do not understand whistles.”
“A shrill whistle scratched out of the dank cloud surrounding him. A second soon followed.„Two freighters are doing a whistle pass,“ Betty said behind him. „Is that how you intend to leave this, Gabriel? You and Mr. Harris were but two lonely hearts conducting a whistle pass through the fog of your lives?”
“Whistling to keep up courage is good practice for whistling.”
“If you want me, just whistle. You know how to whistle, don't you, Steve? You just put your lips together and blow."(as Marie 'Slim' Browning in To Have and Have Not)”
“When you want to wet your whistle,drink water that is clean as a whistle.”
“Kurogane: You just said "Buu" with your mouth, right? That isn't whistling.Fai: I don't know how to whistle.”