You were in karate club as usual,practising,when your pest friend came...he was brow belt whilebu were red belt. He sometimes could be senseis change and he was very popular. As older member he had more respect,even if nobody had to respect him,he still lived to tease you...You were sittiing on floor waiting for others and you heard Itachi say

Itachi: Smirking "Guess whos sensi todayyy~"