This episode from the beginning to the end was unintentionally funny. In Bully Boogie, Grim meets up with the bully, aka Boogieman. Grims tricks fail until he scares that kid in the bathtub. The duck scene was hilarious. I also found the ending to be a good one.
Then, in Here Thar Be Dwarves, the beginning was great, when everybody was flashbacking the picnic. This gag has to be the funniest in the series! Then, the zombie-looking Yogi Bear and Boo-Boo scene was slightly scary. This episode was really well written. That koala scene was too cute for the series and the ending where Richard Steven Horvitz (Billy's voice) sings, that was probably the best part of the episode.
Overall, these two episodes will make you laugh, if you get the Yogi Bear joke and other minor jokes!