This thread is beginning to read a bit like that Readers' Digest "Humour in Uniform", which didn't really work because, in almost every example of banter which ever occurred, you really have to be there! Banter is spontaneous, and best remembered because repeating what really cracked you up isn't the same. You never get the same enjoyment from writing it down, more's the pity.
I took my grandson [16] a 6th Former, and his mate, to the local AA to do their preliminary Driving License test. There is a charge for this, so I told said grandson, "Do it once do it right" and he did. Passed first time. His mate, however, failed by one question and, not wanting to come back, stumped up with the money to sit the test again [it's all done on a computer]. He failed a second time, and he wasn't a happy chappy, a feeling mercilessly made worse by grandson who told him: "If you feel bad now, just wait till Monday when I tell the whole school". Banter is alive and well it would seem!