Might be it's the sound from his asshole farting-sound that made him thought that his pants got torn also, sigh!

Well ..... it's the sound produced thru the southern channel of the southern hemisphere ..... unintentionally though! .... itu sebab dia terasa termalu dan pura2 naik berang dgn penonton (sebab dia terasa yg penonton sedang memerhati akan gerakgerinya ..... sampaikan nak tukar (salin) seluar pun maseh nak tengok jugak (kerana itu seperti menceroboh 'privacy' seseorang tu)  ... yet this is another of the two-way communication between the screenplayers and the audience (as introduced in  earlier parts of that film).