|"Oh my gosh! , this is bad!" – Dukey|
|"Johnny Double Coupons"|
|Season 4, Episode 11b|
|United States Airdate:||April 5, 2010|
|Canada Airdate:||February 4, 2010|
Johnny Double Coupons is the second part of 50th episode and the 100th episode over all.
Johnny wants to attempt to skateboard down the dreaded Suicide Hill. Dukey, however, doesn't want him to. In addition, Johnny's sisters keep on redeeming their Johnny Coupons. Johnny makes JohnnyDoubleCoupons to try and get out of this to ride on Suicide Hill. Though it then rains causing him to hold off on it, Susan and Mary then have redeem more of his coupons with experiments in which Mary is constantly forgetting a small part which cause Johnny to hit solid surfaces (usually a wall) instead of the mattress.
- More evidence that the show takes place in California is provided when Johnny talks about the Santa Banana winds (parody of the real-life Santa Ana winds).
- After the twins set up the water slide to rescue Johnny, they set up a ramp. As they drive away, it looks to be two Marys, no Susans.