heads off to work, he picks up his travel mug, promises to be back for a family photo shoot and gives an unacknowledged, "See you all later." Sheldon doesn't look up from his book as his father ...

He even asked Bernadette to take a picture of him with it so he could put the photograph on a mug, computer mousepad and calendar. Sheldon became so obsessed with the bird, he named it Lovey-Dovey ...

It all ended with a big bang. “The Big Bang Theory’s” spinoff prequel series, “Young Sheldon,” has ended on CBS after seven seasons. Spoilers ahead for the “Young Sheldon” series finale.