I heard from A Talmid of Rav aharon Kotler ZTL, that in Lakewood Yeshivah, The senior bochurim would present Rav Aharon Kotler with a deep "lomdis" chaburah, of Purim torah. Sometimes if the Purim - Torah said included making fun of torah ideas, Rav Aharon would say Nuuuu Sha Sha!! and go on to the next bochur's torah.
I Also heard from Rav Hillel Zaks ZTL, That when he was a student in Bais Medrash Elyon, under Rav HaRav Reuven zt"l, One Purim he told HaRav Reuven zt"l that he wants to tell him a purim torah.
Rav Reuven allowed him to say it and he began with citing a Rambam and asked 5 questions on it from 5 different gemarahs, and then quoted a few more gemarahs and rishonim and achronim which he used to answer the questions.
When he finished HaRav Reuven Grozovsky zt"l asked him why he had called it a Purim torah, as it was an amazing piece of Torah?
Rav Zaks ZTL Answered, "Yes all of it was truly amazing - except for the first Rambam which does not exist and I had made it up on my own".