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

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...

I find it interesting that the majority of these posts are past tense.