The seventh year Slytherin laughed a bit. He certainly knew a great deal about almost getting expelled. The first time he had been threatened with that punishment was the first time he publicly made another student go into fits of madness, raving about the large spiders and serpents crawling and slithering in and out of his body even though there was clearly nothing there. The work of a Fearful Hex, a cruel spell Casimir took the time to master to fully exploit the fears of those he targeted. It was a wondrous moment to see that upstuck and audacious Gryffindor scream like a girlz but eventually the moment ended when he was put to sleep and healed by a teacher. 
What had been his punishment in the end though? Casimir didn't remember.

"My 'almost suspensions' or expulsions often result from me putting some insufferable fool in their place. I'm honestly more surprised I haven't been expelled yet, considering hexing and jinxing others is something I do nearly every year to a few students from each house. Even our own. Can't ever be too lenient to others when respect is involved."