I DO NOT OWN THE POTTERVERSE!
Harry held his breath to hold the laughter in until he got under -very temporary- control. After sending the note to Snape last night he didn't expect a reply. Turns out he got one, then another..
and finally, in the middle of breakfast...
Is Voldemort allergic to anything? H. P.
Yes. Cats. Now leave me alone.
Dear Prof. Snape,
Can we make him sneeze? Please?
POTTER WHY ASK SUCH A STUPID QUESTION?!
HE HAS NO NOSE! PLEASE MAKE HIM SNEEZE!
Harry knew when Snape read his last reply when he thundered out for (to everyone else) no reason, "80 POINTS FROM GRYFFINDOR MR. POTTER!"