Watch until the part when he starts to get the 'Kelp' bar. Then watch carefully. when he starts to put his hand it and the bus goes 'VROOM' everytime he puts his hand in. When Sponge-Bob runs over twords the bus, He runs right through the bus!! Wow!
In other words, the episode is called "rock bottom". the one where spongebob goes to a strange town after he comes back from glove world. Spongebob gets hungry and decides to get a kelp bar. then a bus appears and everytime spongebob sticks his hand in the machine to get the kelp bar, the bus makes a vroom noise. then when spongebob decides to forget the kelp bar and make a run for the bus, he goes through the bus. I'm not saying that he does, or agreeing with this person, I'm just explaining it.
If you watch carefully, he doesn't go through or around the bus, he walks straight (making it look as if he's walking through the bus), but the bus takes off before he makes it across the street, so the part you are watching is when he is directly behind the bus as it is taking off
Not a slip-up