What's with all the 'comics' which have no actual humor - ie no setup, no punchline, etc? #3 / #6 and many others. "...I am doing something. Now I am doing something else. And something else happened. The end..." ...And you children complain about supposed Dad jokes, such as puns, which require creativity and education? Whatever.

It means that you don't get it. Some of them are not supposed to be funny. For example #6 made me think about how it works that people do not believe in things that they could not see by themselves. It's natural and sometimes good not to be gullible (snake) so when we are trying to convience people into something (like turtle) we should not be surprised that they are not going to believe us.
What about #3? I thought that someone just imagined that character on familiar meme looks like holding invisible corn on the cob and he/she let us know about it by making meme.
Bad day huh? We don't have to smile at everything we see.