It seems i am more hardcore in horror tastes than most of you guys 
I don't really like jokes/funny moments in horror. I like funny memes (and do laugh with them), but horror should be a little serious so as to work a bit (even when remaining serious, it usually doesn't work at all; which is a shame). 
I must admit, I only watch horror to laugh.
But there's a good reason for that. As far as I know (based on a book I read once, please correct me if I'm wrong), laughing is a nervous response to seeing something that defies expectations. It's why you can laugh at someone suddenly hurting themselves (and why there is a German word for exactly that), it's also if you think about it, very similar to horror. Since people are scared of things they don't understand, which of course includes the unexpected, especially people suddenly being stabbed through the chest by someone who appeared out of nowhere.
Have you noticed any similarities here? Someone hurts themselves, and it's either funny or scary, depending on the context. Because the only real difference I can find between something being funny and something being scary, is that for it to be funny, you need to realize at the end that there's no immediate danger. It's like "Oh I'm scar... no I'm not! Ha ha!"
So in my opinion, horror is the perfect partner for comedy. And even a pure serious horror can be hilarious if seen from the correct angle. I remember sniggering at Georgie having his arm ripped off by IT in the newest movie. Or maybe I'm just a psychopath. That's also possible.
Another thing to note. There are some horrors I just can't laugh at because I'm too much of a coward to find it anything but terrifying.
