Oh you is a bad elf, Dobby!

Yes, Harry Potter!” said Dobby at once, his great eyes shining with excitement. “And if Dobby does it wrong, Dobby will throw himself off the topmost tower, Harry Potter!”
“There won’t be any need for that,” said Harry hastily.

Harry Potter set Dobby free!" "Least I could do, Dobby", said Harry, grinning. "Just promise never to try and save my life again.

Harry Potter mustn't be angry... Dobby hoped... if Harry Potter thought his friends had forgotten him... Harry Potter might not want to go back to school, sir...

If [Harry Potter] knew what he means to us, to the lowly, the enslaved, we dregs of the magical world! Dobby remembers how i was when He-Who-Must-No-Be-Named was at the height of his powers, sir! We house-elves were treated like vermin, sir! Of course, Dobby is still treated like that, sir, but mostly, sir, life has improved for my kind since you triumphed over He-Who-Must-Not-Be-Named. Harry Potter survived, and the Dark Lord's power was broken, and it was a new dawn, ir, and Harry Pote shone like a beacon of hope for those of us who thought the dark days would never end, sir. . . .And now, at Hogwarts, terrible things are to happen, are perhaps happening already, and Dobby cannot let Harry Potter stay here now that history is to repeat itself, now that the Chamber of Secrets is open once more -

He sounds exactly like Moody," said Harry quietly, tucking the letter away again inside his robes. "'Constant vigilance!' You'd think I walk around with my eyes shut, banging off the walls....