Bob the fork

Last night we were in the van, and I handed Declan a plate of food and a fork to eat on the way. He asked me "What is this?" and I said "it's lasagna" but then he held up the fork and said "No, what is this?"
"a fork"
"No, what's its real name?"
"fork"
"but what's it's real name?"
"it's really called a fork!"
"No, I don't mean that! What's its REAL name?!?"
Mairead breaks in from the wayback seat and says "Bob"
Declan: "oh, Bob? cool."