Panthers, Bears have entertaining back-and-forth on Twitter

A simple Carolina Panthers tweet trumpeting their depth at wide receiver somehow turned into a lengthy exchange of GIFs -- mainly of cats and bears -- with the Chicago Bears' Twitter account, which ended when Panthers coach Ron Rivera got involved.

The Panthers' wide receiver tweet got the attention of a Bears fan and things escalated from there.

The last word went to Rivera.

The lesson learned here is that team Twitter accounts have an alarming wealth of GIFs to work with.