Unlike previous seasons, there are a few running gags in Season 20.
Exploding Truck GagEdit
One of the running gags is that during the impalement gag, a vehicle, namely trucks, crashes, causing a huge fire. Its a running gag because the impaler purposely does it where a vehicle can crash.
According to Yami Bakura, the gag just doesn't feel right without the "Exploding Truck" gag.