Now what do you do ?
Point out just HOW BADLY you missed the joke and demonstrate to everyone else just what the language barrier DOESN'T help with. Jokes. Humor. If the "Master of the Obvious" title wasn't already taken, you still couldn't apply.
This is being done for YOUR benefit, so don't repeat your normally combative reply thinking you're just joining the fray. You're missing so much, and it almost got you a (somewhat) well deserved vacation. I wanna see some progress on your cab, which you won't be able to do. I also think you CAN be an enjoyable addition to the nuthouse, if you can pick up on some of the insanity and inside stuff that goes on here.
he was feeling *hic* good. 
he was drunk too
Now DON'T get wrapped up in "proving" yourself. You flat didn't get it. It's ok. It'll come with time, which you won't have if this course continues.