Heppoko Jikken Animation Excel♥Saga, Koukaku no Pandora Recommendations
Same original creator (or co-creator in KnP case)
Same weird vibe and spastic humour
Many characters share similarities in appearance and personality.
Sexual references and dirty gags in both
besides ES is more lighthearted and episodic while KnP is a bit more serious and have something that resembles a plot but still episodic, in short, two enjoyable "turn off your brain" comedy shows if you like that stuff.