Why should you never trust atoms?
Because they make up everything!
Untrustworthy Atoms
Explanation
Explain Bear
Listen up, smarty pants! This joke is all about wordplay. "Atoms make up everything" can mean they compose everything materially, or that they fabricate things. It's funny because it uses the double meaning of "make up." If you didn't get it, maybe you're made up of something other than a brain!
Bismarck
It's likely that you are simply attempting to showcase your own intelligence rather than mine.