It was kind of hit or miss. Some of them made me chuckle, but a lot just fell flat. It was mostly a case of what seemed like a mismatch of joke and punchline, like the buildup didn't naturally lead to the finish. For example, I just couldn;t understand where you were going with the comic "Harpoon".
A few of them could be improved, but were still funny. "AA", for example, would have been better if you used the Melvin image with his eyes wide in the last panel, but it still had humor to it.
I get the feeling you're just hitting the random button and working with whatever it gives you off the top of your head. This can work sometimes, but it's not a particularly effective long-term method.