In the DK arcade, the ehhh ehhh ehhh when Cranky smiles at you when you first begin the game.
DK Jungle Cimber, Funky: Heeeeyyy Maaayyyyynnn
Dixie's crying from DKC2
the sound of the minecart clanging from DKC1
I really like the sound of exploding TNT barrels, and the sound that plays when you jump off one of those red crocodile head things in DKC2. :)