Rob Gronkowski and Martellus Bennett share nicknames on social media

FOXBOROUGH, Mass. -- New England Patriots tight ends Rob Gronkowski and Martellus Bennett stole the show during a rainy practice Sunday morning, providing a potential preview of how they could become a lethal tandem for defenses to handle.

Then they had some fun on Instagram coming up with nicknames for themselves.

Gronkowski started it by posting a picture of him and Bennett doing a reverse chest bump after Bennett caught a touchdown pass, writing, "Ebony and Ivory." He tagged Bennett on the picture.

Ebony and Ivory @martellusb

A photo posted by Rob Gronkowski (@gronk) on

One hour later, Bennett posted a different photo of him and Gronkowski on the practice field, writing, "Feeling like Ken and Ryu. Hadouken!!" He tagged Gronkowski on the picture.

Feeling like Ken and Ryu. Hadouken!! @gronk

A photo posted by Martellus Bennett (@martellusb) on

So it's either a classic song from 1982 by Paul McCartney and Stevie Wonder ... or a takeoff from the Street Fighter video game.

Let the nickname contest and tandem comparisons begin.

If Sunday's practice is any indication, followed by the social media chatter between the two, the fun is just getting started.