I for one like dark jokes that tend to offend people. i enjoy the ones that get under your skin and you dont even know why you hate it but you just do.
What really gets me going is taking the piss out of people (which usually involves dark humour), also any humorous things involving people I know usually seems funnier
I like jokes that make u think why. Sometimes it may take a bit to get, but when you do, you will be like doh!! The laughter comes from the fact that it took you awhile to get the joke. So mainly it's more of an achievement