Kyrie Irving and the Boston Celtics have rattled off nine straight wins, including last night's W against the Atlanta Hawks. Kyrie once again led the way for Boston, scoring 35 points and dishing out seven assists in the 110-107 victory.

The Celtics' win on Monday night came against the same last-place Hawks team that beat LeBron James and the Cavs in Cleveland on Sunday night. And don't think LeBron hasn't noticed how his former teammate is doing thus far.

Shortly after The Cs beat the Hawks on Monday night, LeBron shared his first cryptic social media post of the season, which featured the caption "Mood..." underneath a photo of the angry Arthur meme.

LeBron has yet to comment on what that was about, but we're sure he'll be asked about it as soon as the media gets a chance to speak with him. The Cavs, now 4-5 on the season, will host the Milwaukee Bucks tonight before embarking on a four-game road trip that includes stops in Houston, Dallas and New York.

The Celtics, on the other hand, haven't lost since opening up the season 0-2. Kyrie and co. open up a three game home stand tomorrow night with a nationally televised matchup against the Los Angeles Lakers.

Scroll down to check out some of the reactions to LeBron's latest cryptic social media post.