The noise made when lightning strikes someone named Wilson.
The Wilson brothers say “wow” a lot, and they also say “Wilson” a lot, since their last names are Wilson. Lightning makes the noise “kachow”, and Owen Wilson says “kachow” when he turns into a racecar, Lightning McQueen. The existence of “Wow” and “Wilson”, indicates the existence of “Kachow” and “Kachilson”.
*KACHILSON!*
Oh no! Are my next door neighbours, the Wilsons, all right?