Arnold Schwarzenegger decided to poke some fun at his old buddy Sylvester Stallone on social media. Stallone hasRambo: Last Bloodhitting theaters this evening and Schwarzenegger wanted to wish him luck at the box office. However, he couldn’t resist having some fun with Stallone and made a joke about the knives they both signed for charity. The two action mega stars were once rivals back in the day, but they have since become great friends and co-stars who enjoy giving each other a hard time on social media.

In the video message toSylvester Stallone, Arnold Schwarzenegger compares the knives they both gave to charity. Stallone’s is signed and it looks like it was used inRambo: Last Blood. However, Schwarzenegger brings out an even bigger knife, which was used inPredatorand did the famousCrocodile Dundeedialogue about knives.

WhileArnold Schwarzenegger’s Australian accent needs some serious work, his humor is on point. He says, “Good luck withRambothis weekend, Sylvester Stallone. I loved it, and when it’s a hit I’m going to buy you a new knife to celebrate.”

Sylvester Stallone was pretty happy about his old friend’s message and even reposted it tohis social media accounts. But, he did have something to say in response. Stallone said, “Thank you very much big man. You’re a great friend, and a great star, but my knife is always going to be sharper than yours!” It’s nice to see the two friends having fun on social media together to promote a charity andRambo: Last Bloodat the same time. Once the promotional tour is finished for the upcoming movie, there are many who are hoping that Arnold Schwarzenegger and Stallone willreunite on the big screen for Expendables 4.

Sylvester Stallone has teasedExpendables 4a few times this year. Back in March, he shared a picture of himself, Arnold Schwarzenegger, and Bruce Willis, which obviously had fans excited. Then, on the Fourth of July, the actor posted a picture of himself from the franchise and revealed he had some new inspiration to work on the story. While there isn’t anything concrete, we should end up hearing about the highly anticipated sequel in the next few months and find out who will be starring alongside Stallone when the cameras start rolling.

Sylvester Stallone has his sights set onRambo: Last Bloodthis weekend. The sequel is estimated to make anywhere from $20 million to $24 million. This could be enough to take downIT Chapter Two, which has held the number one spot for the past two weeks. However, there will be some other competition withAd Astraand theDownton Abbeymovie both debuting this weekend too. Regardless, it looks like Stallone should be able to take the win for the weekend, as long as the earnings end up on the higher end of the spectrum. While we wait to see howRambo: Last Blooddoes in theaters, you may check outArnold Schwarzenegger’s Instagrammessage to Stallone below.