This one actually happened at school when i was a kid. 
Masterjee was reading out texts in geography and he was telling us the significance of caves… Kaawn in urdu.
He said
"Kaawno main bohath se faide hote hain…
kaawno main aadmee heera mothi (diamonds and pearls) dhund the hain, kaawno se coala nikaal tha hain (coal)
kaawno se bohoth zaida dunya kaa soana (gold) nikaal tha hain… 
At this point one of the boy, naheem was falling asleep so masterjee shouted at him and said:
“Naheem tum ne suna kyaa kaha!”
Obviously Naheem hadn’t heard masterjee so some other boy whispered
“kaano se soana nikaalta hain!” (gold is found in caves)
Masterjee asked Naheem “Kaano se kia nikaltaa hain!”
Naheem said " Ooh Masterjee aab sumaaj ayaa ke ap mere kaan (ears) kyoon chikteh hain (pull ears!)" 
Masterjee ne to phir 
