It’s been a long time since I didn’t laugh watching a com edy, as with “Splinterheads,” a lame “Napoleon Dynamite” wannabe.

First of all, Thomas Middleditch, as a slacker geek, has none of the charisma of “ND” star Jon Heder. Secondly, the jokes in “Splinterhead” are few and far between.

Middleditch is Justin, who falls for the amply tattooed Galaxy (Rachael Taylor), a scam artist who works in a carnival. Unfortunately for Justin, Galaxy already has a boyfriend, and he’s mean and ugly.

Now all of this might sound funny, but under director-writer Brant Sersen it doesn’t play that way on the screen.

Sersen throws in a few subplots — Justin’s salty, 116-year-old grandfather, as well as a police sergeant who would like to get Justin’s mom (Lea Thompson) into handcuffs. But they’re not funny, either.

“Splinterheads” might suffice some late night on cable, but that’s about it.