Grammatically perfect drunk texting.
Usually, when people are drunk, you can tell in their texts, because they make lots of spelling mistakes, like this:

But not this guy. *points at self*
For some reason, I can really keep my shit together when I’m drunk. I have to focus like crazy on things like walking, talking and texting, but to the untrained (or also slightly inebriated) eye, I could be sober as a nun.
Now you might say “how is this not useful? I WISH I could do that!”
However, it’s not only not helpful, it’s actually dangerous. When you get a drunk text from someone, whether they pour out their heart, tell you they love you or curse at you, you take it with a grain of salt – they’re drunk, after all!
But when my text to you is grammatically perfect, how are you supposed to know I’m drunk?
So while I always leave a great impression on the people I’m with when I’m drinking, I’ve texted myself into serious trouble with friends and girls because I got way too honest when the timing was way off.
That is my most useless skill.