Disclaimer: I'm not sure if anyone has posted about this before, but I did a few searches and I couldn't find anything about it so I'm going to go ahead and make a new topic. If someone has posted about this before then the mods should just go ahead and delete this thread.
I've seen TAiLS doing this on his stream against both Protoss and Terran players, and I'm sure that if Gaulzi still streams then he'll have been doing it as well. It's basically the same idea as as Cannon Rush on Daybreak: You slam some Pylons down behind their mineral line, you lock your Probe away, you slam down some Cannons, and you collect a free win if they don't respond fast enough...
- 9 Pylon (Chrono Boost Probes Two Times Once Complete)
- Rally Your 10th Probe To Scout Their Base
- 14 Forge
- Build Pylons
- Build Cannons
All of these Cannons are fully walled in...
... and all of these Cannons are fully walled in. I know the bottom one looks like it isn't, but it is because Derelict Watcher has a really weird out-of-bounds area down there!
... it's a cannon rush, dude, what do you want from me?