Things you still find fun...

[swerve]

...despite providing no additional mechanical benefit or particular challenge.

For me:

Getting any miscellaneous (already possessed) rare from a boss chest
Killing Legion (still my favorite boss fight after 200+ kills)
Eating Truffles/Caviar/Foie Gras just to make room for more Truffles/Caviar/Foie Gras
Selling all 9 of any particular item
OHKing anything with the Claimh Solais+1 special move
Successfully using the jump-kick to bypass final guards
Whip-user martial arts kills

There are probably others; that's all I can think of at the moment.

[jagwar1284]

Dual Vals+Miser+ Succubus+ red soma*If I remember to choose it*

or what I like to call

RAGGGGGGEEEEEEEEOOOOMMMAAAAAAAA!!!!!rawr!

[redfoxxie]

Anything really. I make up fun stuff out of fly. Such as going Terror Bear against R.Count (which didn't work out so well) or beating him with Alucard's Dark/Medusa Shield (which didn't go so well either) . Sucking zombies with a vaccuum cleaner (Persephone soul) , killing Asstarts by bird pooping (Medusa Soul + Kung Fugu soul) , Daybreak anything, Mage Alucard..

Mostly using obscure setups.