it's ok, i found the episode already. it's on 08/11/2006. heh.
here's a clearer version (from 6:30)
summary of what they were talking about:
Show said that his manager has been asking around for people to to give NTD 200 to get Show's album. So now Show is gonna do it too. He asked the BFB crew to buy it, like the cameramen and the KB teacher. Then after that he turned and point at XG (meaning he wants XG to buy his album as well). XG said please he already bought 20 (and XG almost blurt out 100). Show asked what is he gonna do with it, and XG mentioned he's gonna ask Show to sign them and then give his friends and Show said including his sister? That's when Show talked about his mum and sis who came to the show to watch them record this episode. Show said that XG's mum is really pretty and looks like Jolin. Then XG said do not take down his mum cus of the way she dresses. He said when she fetched him from school before, his classmates would say "hey your mum is here" and she was dressed sexily, he couldn't take it. Then Show said at least his mum has a nice body, not like his own mum. When his mum dresses sexily he would tell her not to dress as such (LOL). He would ask where his mum is going and when she's going to the town area, he would tell her not to and go somewhere (not as populated) instead. Then his mum would say "can't i be a hot babe". XG said Show's mum is pretty too but Show thinks she's too meaty. Then XG said he shouldn't say his mum like that because she helps him to take care of his dogs and other pets, all of which he bought (he admitted it himself). Then Show said XG's sister is cute but XG said she's average. Show asked if his sister ever talked about him to XG and XG mentioned she did, and said that she really likes him and asks him to help her get his autograph. However XG refused because he thinks it's weird to be asking Show for an autograph because they're good friends (and then XG almost blurted out girlfriend instead of sister when he was giving an example). Then Show kept asking XG what did he say previously, and if he's sure that's his sister etc (just trying to get him admit he almost said GF earlier).