Oh yeah it had happened to me before, I find it so hilarious! I would end up laughing when someone talks this way to me. "Doooooooooo... youuuuuuuuuuuuuuu wannnnnnnnnnnnnt sommmmmmmmmmmme... then I would respond "noooooooooooooooooooooooooooooo!!' and they looked at me like what the.... 
And I also love it when some hearing people thinks shouting will make a deaf person hears better. I'm like, "eh no! matter of fact you're making me more deafer than I already am!"
They would be like "Oh, I'm sorry". 