One of my fondest memories from SCGS was a particular lesson with my sec 3 e math class on the proofs of circle properties. Earlier in this class, i had rejected a students' proof. 20 mins later, i was presenting my proof of another circle property. This student returned the favour by pointing out that my proof was invalid, because i had violated the same rules that i pointed out earlier about her proof. On the spot, decided to work out the proof using a different route, albeit a longer one. As the class saw how I tried to work out a proof on the spot, those who followed along began to get more excited as we got nearer. A few of them even suggested how I could proceed with the proof. Eventually we worked out the proof, and there was a round of applause. I miss such classroom moments. I was able to show them that the (1) teacher is not immune to criticism, (2) my failed attempt motivated me to immediately find a better solution - resilience, (3) I do not have all the ready answers and the students can contribute as well to working out a problem.