What is the most FUN pair of speakers you've ever had and why?

Man, this was long time ago, but here goes. I had just gotten ripped off by the local music store owner for a pair of John Zeer speakers. I lost $380 of really hard to earn dollars back in 1975. That got me starting to look at the other end of the spectrum. If JZ was crap, then what was the best (according to a high school junior)? From what I could gather in my cowtown in Wyoming, it was the K horns. Great, how much? Too much for me. Then I discovered Speaker lab in Seattle. They had a kit in which you could copy the Khorn design called the Speaker lab K. Ok, so I built the pair in my senior year in woodshop. Everybody was shaking their heads. Why was the driver inside the cabinet like that? 
 When finished, I was to never hear bass like that ever again. The midrange and tweeter horns were ok, mind you but the bass was pant leg rattling. What more fun could any high school kid have than to own a pair of these?

They were Speakerlab K's for me too!  Sometime in the early 1990's one of my coworkers took a job in Alaska and did not want to transport his pair all that way and asked if I was willing to give them a home.  I do not have them anymore, but only because the octagonal configuration of my current residence is simply not corner horn friendly.  I very much miss that 'massive' sound though! 

Tekton Pendragons - the most fun I’ve ever had in a speaker, they just get cleaner and overwhelmingly powerful the louder you play them. Every time I really push them it just makes me giggle, I can’t believe they can produce concert level sound and stay absolutely clean and retain such intricate definition. Definitely make ya smile!

@ asat:  I hear you, buddy.  Totally understand. 

The Totem Arro the way they respond to changes in the chain is like getting new speakers all over again. Their soundstaging and tone are first rate for any speaker at any price or size...