After the San Francisco 49ers and Detroit Lions finished a close game, things got ugly for the up-and-coming teams.

Jim Harbaugh, the new 49ers head coach, and Lions' head coach Jim Schwartz met for a post-game hand shake, and Harbaugh appeared to be over-zealous in the way he greeted him.

Obviously excited by the 49ers 25-19 road victory, Harbaugh raced over to Schwartz with a great deal of energy, and lifted his shirt to expose his belly for what was probably meant for a chest bump. Harbaugh extended his hand to Schwartz, and then slapped him on the back with his other hand, and then hooted as he jogged away.

Schwartz was clearly unhappy with this gesture, later claiming he heard an expletive. Schwartz went after Harbaugh after the slap, which was followed by players and security stepping between the two coaches.

I went to congratulate coach Harbaugh and got shoved out of the way, Schwartz said, according to ESPN. I didn't expect an obscenity at that point. Obviously, when you win a game like that, you are excited, but there is a protocol that goes with this league. 

Harbaugh, who had a running feud with Pete Carroll when the two were coaching in the Pac-10, is known for getting overly excited, and  for being an ungracious winner. While Harbaugh was at Stanford, he met Carroll for a post-game handshake after handily defeating USC at the Los Angeles Memorial Coliseum in November 2009, and was overheard saying, What your deal?

When asked about the confrontation with Schwartz, Harbaugh was glib.

That's totally on me, he said. I shook his hand too hard.

Harbaugh also said that if his excited personality offends you or anybody else, then so be it. 

Both the Lions and 49ers have a 5-1 record on the season, exceeding preseason expectations.