Washington (CNN) Donald Trump doesn't laugh.

That's according to former FBI Director James Comey, who told ABC's George Stephanopoulos that he developed a bit of an obsession with Trump's lack of mirth after the President fired him last May.

Here's the exchange between Comey and Stephanopoulos on the lack of laughter:

STEPHANOPOULOS: You notice something else -- during that dinner. You say the President didn't laugh.

COMEY: Yeah, not at all. And I was struck by it. So struck by it, it stayed with me, that I've never seen him laugh. Not in public, not in private. And at a dinner with someone -- I mean, I'm not a comedian but I occasionally say something that's funny that people chuckle with each other.

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