Pump action shotguns. I have two very nice Rem 870s - one is an older '70s manf. police wingmaster, the other is an early 90s 870P. also grabbed a cheap posurp mossy 500A that smells like cigarettes (friends don't let friends Gunbroker drunk).
I probably spent close to $1k setting up the 870P, including the SF foreend, sidesaddle, magpul stock, etc. I put exactly 5 rounds of 00 buck through it and it has sat in my safe ever since.
In addition to all the reasons they aren't the very best longarm for personal protection, they're just... not really very fun to shoot.
I can see myself setting up a semi auto and enjoying that a bit more, but honestly, if I were to get another shotgun, it would be for the purpose of getting into the clay shooting sports or maybe 3 gun. For every other purpose, I'd way rather have an AR.