This is an example of the one that probably gets to me the most... (and I see it and hear it EVERYWHERE!)
"This is a photo of Bob and I."
Would you say "this is a photo of I"? NO, so say, "this is a photo of Bob and me" if you would use "me" alone! However, "Bob and I are in this photo" is correct because you would say, "I am in this photo" if Bob wasn't there.
Whew, felt good to get that off my chest.
Next...
"This is a photo of Bob and I."


Whew, felt good to get that off my chest.

Next...