Knock-knock. Who's there? To. To who? No, to whom.

 342

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Q: Did you hear oxygen went on a date with potassium? A: It went OK.

 1405

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Two kittens on a sloped roof. Wchich one slides off first? The one with the lowest mew.

 1044

0  

Q: What did the elf say was the first step in using a Christmas computer? A: "First, YULE LOGon"!

 1703

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Two chemists go into a restaurant. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" - and he died.

 894

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