Gintama, Daily life of hs boys and hinamatsuri, Gintama is best tho
For me it was Hetalia and Ms. Kobyashi's Dragon Maid.
gonna have to second on the Steins Gate choice, had me laughing my ass off
Konosuba, there was also one about this pervert mangaka guy, it was so exaggerated cant remember the name of it though.
I'm also going to say Gintama, but I'll also add in a Hinamatsuri and The Disastrous Life of Saiki K. to the mix. I really enjoy the types of comedy where the characters work off of each other to tell jokes. (Especially the straight-man routine where one character reacts to the absurdity of a situation the other characters are in or pulls them into.)
The trash anime (It is trash and so am I!) Eromanga-sensei was hilarious as hell to me. Konasuba as well! Even went and bought a Konasuba shirt... And wearing it now XD Just some of the first things to come to mind.
Hm... Never seen Gitama before, only heard about it every so often.
Along the line of gintama, sket dance.
Some other ones:
Baka to test to shoukanju
Cromotie high school
Daily lives of high School boys
Comedy is my favorite genre :D
Baka to Test hands down one of the funniest ones I've seen. Sakamoto desu ga? is right up there with Baka to Test.