Wow, it's hard to believe David Letterman has been doing late night television for 25 years. He's the gold standard. His work on NBC is what most hardcore fans remember most, as it was fresh, fun, silly, and groundbreaking (watermelon breaking, too).
His CBS work has been good as well, but it's hard to top those early days. I miss Larry "Bud" Melman.
Happy 25th, Dave!
Here is a montage of clips from his NBC days.