Number 2: Revealing a giant killer snake lives downstairs is not the right way to get first years to behave
Screaming that's all our favourite boy wizard could hear "couldn't they shut up for a moment" he silently asked himself knowing if he said it aloud then the resident bookworm and his only female friend would hit him rather hard on the head.
Or worse he didn't really want to be hexed by that witch he would swear that she and Ginny were practicing hexing people for the fun of it.
But back to the matter at hand the screaming was getting louder if that was possible he knew that he was better behaved then that when he was a first year.
That's it the first years innocent little first years so easy to trick they would believe everything he told them.
If you had watched Harry at the second you would have seen the rather sinister smile that would have made even Voldemort pause for a second at the sheer evilness in his smile.
"Oi first year midgets have you ever heard about the giant snake" he asked smiling sweetly. (well he thought it was sweetly)
"What snake" a brave girl in the back asked.
He fakes a gasp "you don't know about the basilisk".
"What basilisk" a different child asked so warily he had to stop himself laughing.
"The one that lives down stairs in the basement he moves though the pipes eating naughty loud children".
"WHAT" a little girl screamed Harry quickly hid his smirk.
"yes its true Moaning Myrtle was bad and the snake killed her ask her if you don't believe me" he told them nodding sadly.
THE NEXT DAY (in the great hall)
"POTTER"
Was the first thing Harry (and everyone else) heard when entering the Great Hall for breakfast that morning.
"Yes professor" he asked sounding quite confused and looking it too.
"What did you say to the first years" the head of Gryffindor half yelled half asked.
"Nothing what makes you thinks I said anything" he said trying and failing to look innocent.
"A fifth year saw you talking to them last night and now they are perfectly behaved but scared of even talking" he pretended to think.
"Oh I only told them about the basilisk" he said like he had discovered world peace or something professor McGonagall suddenly looked tired.
"And what may I ask possessed you to tell them that" Harry looked her in the eye and said something the school was not expecting. (They thought especially the Slytherins that he was just bragging)
"They were giving me a head ache" the professor sighed at her students completely serious expression.
"MR POTTER"
"Yes" he replied looking kind of Resigned she then said something which had become a usual occurrence lately.
"DETENTION MR POTTER"