Elon Musk has some thoughts about WhatsApp.

Specifically, the Tesla CEO thinks the Facebook-owned messaging app is a hackable piece of garbage. He made that much clear in a Thursday morning tweet that both highlighted a new emoji and pointed out that the WhatsApp-specific version comes with a not-so-special bonus.

"New emoji," wrote Musk. "Last one comes with free phone hack."

If you enlarge the below image, the "last one" just so happens to be the WhatsApp version of the robotic arm emoji.

New emoji! Last one comes with free phone hack. pic.twitter.com/T3jjwZycog — Elon Musk (@elonmusk) February 6, 2020

Musk's dunk follows multiple high-profile news reports of WhatsApp vulnerabilities. We learned this week that a WhatsApp bug would have let hackers read files on a victim's computer. And last month a security firm hired by Jeff Bezos claimed that the Amazon CEO's phone was likely hacked via a WhatsApp exploit.

SEE ALSO: Mic on Bezos' hacked phone possibly compromised for months

In other words, things aren't looking so great for WhatsApp right now. Musk just so happens to enjoy rubbing a little Twitter salt on its hackable wound.