They thought that Grandpa in Clinton, Maine would only taste it and figure out it was cat food...he went back for several bites!

 

It's a tad mean...they said:

We planned on pranking our grandfather by getting him to try some cat food. We removed a majority of the label from a cat food tin so it only displayed chicken and beef flavor. It was actually a last-second decision to record this and I took the angle behind him so he didn't suspect anything was going on. Clearly, he caught on rather quickly, but he still went for not only seconds but thirds before coming to the conclusion that he was actually eating canned chicken and beef cat food. None of us expected him to do more than taste it, let alone go back for thirds.

 

When Grandpa figures it out, he lets out a few f-bombs...so be warned!