The tytlal, in David Brin's "Uplift" novels (particularly discussed in the Jijo trilogy), are extremely fond of elaborate practical jokes - almost everything they did on Jijo was part of a practical joke aimed at the entire rest of the Five Galaxies, which took several millennia to unfold...
Niven's kzinti do have a kind of rough sense of humor - you don't often see them making jokes in his stories, because usually kzinti are only in the stories when there's something violent going on, but Speaker-To-Animals (the direct translation of the kzin title for "Ambassador") did crack a few kzinti jokes in Ringworld. (Nessus the puppeteer had a sense of humor too - but in his case, it was a symptom of his mental illness. Since puppeteer laughter involves taking their attention off the world around them, they consider it as "an interrupted defense mechanism" - and as Nessus explains to Speaker, "no sentient being ever interrupts a defense mechanism.")
Motie humor usually revolves around either their fatalistic view of the world (since without FTL, their life cycle compels them to overbreed and collapse their civilization every few thousand years) or the rigid caste structure their DNA has evolved (as when one brown-and-white Mediator, when asked by a Master if she was positive about something, protested, "Am I a Brown [the Engineer caste], to be certain?"). It's not easy for the humans they encounter to understand, nor do they readily understand human jokes, although one of the Mediators sent to talk to the Empire of Man did try to tell an old Persian joke to explain why she was even sent to talk with the humans, with the Mote on the verge of collapse once again. She got the essence of the joke, but didn't quite understand how to deliver the punchline. (It was from the tale of a thief, condemned by the king to die for his crimes. He begged for mercy, and the king gave him one more year, on the condition that he teach the king's favorite horse to sing - if he succeeded within the year, he would be freed and rewarded, if he failed he would die. The other prisoners mocked the thief for agreeing to this, but the thief pointed out, "A lot of things can happen in a year. The king might die, the horse might die, I might die, the horse might learn to sing...")
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Sodium is a metal that reacts explosively when exposed to water. Chlorine is a gas that'll kill you dead in moments. Together they make my fries taste good.