Pretty classic theme type - adding letters to make whacky phrases. I think this particular letter string being added could go on for a...

I KIND OF GOT INTO A STREAK OF MAKING THESE PUZZLES WHERE I ADD WORDS TO A FAMILIAR PHRASE. THEY ARE KIND OF FUN. I LIKE 18-DOWN AS A...

MY FIRST PUZZLE OF THIS ILK. I REMEMBER A PUZZLE WITH THE THEME "YES, AND" THAT I WAS IMPRESSED WITH AND ALWAYS WANTED TO TRY SOMETHING...