Couldn't the writer have told us about excessive laughter? Perhaps Henry kept howling over something others found only slightly humorous. How would we know? The writer took the easy way out—he used an over-generalization that doesn't communicate well. (Originally, I wrote a sweeping statement, but that sounded like a cliché.)
LOL has become popular in tweeting and I often wonder if they really do laugh out loud. More likely, it means, "I thought it was funny."
I ask myself what I want to say;
then I use appropriate words to express my meaning.