I get a request to architect the application Infrastructure to handle 1000+ concurrent connections per second. Ridiculous? Yes. But since the one ordering is my boss, I set out to do exactly that and pulled it out as well.
Thanks to ELB, ASG, custom AMI and a couple of sleepless nights. Oh and I also had to design redis and the web server to handle the load.
Had a ton of fun experimenting stuff. Not to mention creating a test machine to simulate that damn load!