You, Saotome and Tendo were assosiate to train together with your master, Happosai. But you have a feeling that he was using you to get underwear.

you were carrying a big rock while leading him up with Genma and Soun when you see Happosai coming to you with a bag full of underwear, then you see Genma and Soun bowing down to him (they should kill this nuisance.)

"Good afternoon master, we'll bring this rock on the mountain, bring it down on the river, pick all the apple of the city, set a hiding place to put your belongings there, steal a lot of food for us and do our product of underwear of the night as you said!!"