Horrible sense of humor! We used to constantly prank each other ect but in my second last year of high school a guy in the year above killed his friend (stabbed him 3 times in the neck, once in the back and a few times in the stomach) some of my mates found it hillarious. I remember looking at all the blood and saying 'no way is he going to live' and they were literally laughing out loud saying shit like 'ain't my life'. They even went to these group counciling things the school put on and took the piss, saying "I get flashbacks everytime I see tomato ketchup" ect. I didn't stay in contact with them after school.
As for the people I grew up with and am still in contact with, we tend to have a 'normal' sence of humour, whatever that is