A lot of players complain about grinding in Destiny but reliably keep at it nevertheless. One gamer, yavin247, has rigged his Xbox One controller so the game effectively plays itself while he sleeps.
On Reddit, he wrote that he, "Woke up this morning to a brand new 20! Had about 3600 kills, and 900 deaths (lol), and like 50 green engrams. I started at level 16.5 yesterday afternoon, and reached 20 sometime while I was asleep. With the armour I had waiting for him he is now a 26."
He's enhanced his technique to include a second motor and cable-tie which twitches the left thumbstick from time-to-time so the server doesn't think he's a bot and has implemented some shooting so it's not continuous punching.
"To those just now joining us," he continued, "I had a little fun with a couple of servos taped to an Xbox controller to repeatedly kill hive on Ocean of Storms for me. Background: I am a (semi?) serious player with 300+ hours and a 32, but when I went to level up my titan it felt so joyless. So this popped into my head as a fun little challenge.
"I did it more for the hell of it, and I'll be the first to admit I could have done it much faster manually. To those saying it's pathetic, I don't disagree with you. That's why my post title shows some confliction [sic]. But it's much less an exploit (least effective way to level up ever) than a bit of fun, just to see if it could be done, and no one else was negatively affected by it. Some people did get some laughs out of it though."
It probably says a lot about Destiny that this was both possible and effective.