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Chris Pratt, Nick Offerman

Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images

Nick Offerman's new book Good Clean Fun has a lot more than what the title says.

The Parks and Recreation alum appeared on Conan Wednesday and talked to host Conan O'Brien about his new book, which is anything but clean. The actor, who also doubles as a master craftsman in his free time, recalled the first object his father ever built for him out of wood: the tinkle box.

"It was a little pine box for me to stand on so I could tinkle like a big boy," Offerman explained, trying to hold back his laughter.

The book, Offerman explained, is to inspire people to build anything they want. It doesn't have to be beautiful; it just has to be something made of wood—hence the tinkle box. 

Nick Offerman, Chris Pratt, Conan O'Brien, Conan

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The comedian also explained that he enlisted his friend to do the comic-like drawings for Good Clean Fun, and the pal ended up having a little bit of fun with his assignment. Inside Offerman's latest book is a four-page homoerotic comic involving Chris Pratt.

"It's about me and Chris Pratt chopping down a tree," Offerman shared. 

Conan gave viewers a quick sneak peek at the Pratt-inspired comic, and it didn't seem to be about chopping down a tree. Instead, it shows Offerman rubbing lotion on Pratt's back.

"Listen, if you're going to be in the woods messing around with tools you don't want to be sunburned," Offerman said.

They're just being responsible!