Attention How I Met Your Mother Fans, Dirty Joke Afficianados, and Those Who Want To Know The Difference Between Peanut Butter and Jam

Last night on How I Met Your Mother, Barney told Lily a joke that was so dirty, she wouldn't hang out with him for four weeks... which was a really clever way of getting pregnant Alyson Hannigan out of the picture because she was really showing (she's already had her baby here in the real world) and though it wasn't THAT obvious in her face (okay, yes it was but I don't want to seem like some sort of body image Nazi), she can only sit at the table in the bar or hold basketballs or trays of orange slices in front of her big belly so many times. 

(This apparently isn't an issue for the also pregnant Cobie Smulders, whom they must have thought was going to be showing less when writing these episodes because flowing tops be damned, she's also still pretty obviously pregnant, even she had Ted's assistant on top of her.)

So the offending joke Barney told was "What's the difference between peanut butter and jam?"

A possible answer, according to a quick Google search is below and censored for those with delicate sensibilities...which I am actually doing as another level of humor because seriously, what are you doing reading this site then... Highlight it if you need to read it:

"I can't peanut butter my dick up your ass

Which I actually find pretty funny.

Update: If you came here on a Google search to find the answer to this joke, as many people do, please support my site by clicking on an ad below that may interest you. Post continues below.

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But the joke works much better in its original form "What's the difference between jam and jelly?" or it's British/Paddington Bear fan version "What's the difference between jam and marmalade?"

See, there's lots of differences between peanut butter and jam, but... okay, despite what PunkAndy may believe, explaining jokes DOES NOT make them funnier, and this is also true when explaining how jokes can be improved.