Investigation Held by Kolobki is one of many kids' favorite in Russia.
Many Americans should probably recognize this style from two cartoons that you never realized were animated by Russian animators.
That's right, it looks like fuck ugly Clasky-Csupo cartoons, more specifically Rugrats and Ah! Real Monsters. You can read up the history of this collaboration in Igor Kovalyov's wiki-page, who was director of many Rugrats episodes and co-director of Rugrats movie. In his biography it is said that while creating Monsters cartoon he was given basically free reign.
So, if you grew up wondering what the fuck was Krumm, it was quite literally lucid dreaming of a fucked up Russian.