Well, the question's really which of his quotes are funny. He's not the funniest thing in the simpsons, true. If he was, there'd be a spin-off called "Ralph" by now.
"I'm for it so we can put Nuclear power plants up there, and then beam the power back to earth on a laser beam." ~ Whidden
I have NO idea what THAT episode was about. but it sounded hilarious. it's the only quote that made me giggle
"I'm looking for love. Real love. Ridiculous, inconvenient, consuming, can't-live-without-each-other love." - Carrie Bradshaw
"The danger of an adventure is worth a thousand days of ease and comfort" - Paulo Coehlo
Live your life like it's your last day on earth
Life is not how many breaths you take, but how many moments take your breath away.
They were having a science fair and Ralph won because he had a bunch of unopened Star Wars action figures. He was celebrating, tripped and fell on Chewbacca, hence bending his Wookie.