“The one thing about Dave was, even when he was mean to me, it was funny, and that's all that matters,” Leno says in a Hollywood Reporter tribute to his former friend/late-night rival, who is being honored this weekend with the Mark Twain Prize for American Humor. “I haven't spoken to Dave recently,” the former Tonight Show host adds. “He can be a quirky character. It's just Dave being Dave. When I see him with the beard, I smile because other people go, ‘Why does Dave have that beard? He looks creepy.’ That's just his sense of humor. But I'm thrilled that Dave is getting the Mark Twain award.” ALSO: Watch more than eight hours of Letterman interviewing Leno.