Chael Sonnen has taken to Twitter and is running a contest in the lead-up to his May encounter with Wanderlei Silva.

The two will square off in Brazil at UFC Fight Night, but Sonnen doesn’t seem so sure that “The Axe Murderer” will make it there.

“Contest Announcement: Be the first to name the fake injury Wanderlei uses to weasel out of our fight,” he posted on Twitter.

There were plenty of issues getting the Sonnen-Silva fight signed, but UFC president Dana White constantly stated it had more to do with issues in Brazil than Silva himself. Sonnen, though, didn’t buy it and continually called him out for not signing the contract until recently.

Feel free to look up Sonnen on Twitter and provide your answer. Who knows, you might actually win something.