The other day I went flying without connecting my aileron servo. Made 3 mistakes. 1 - Got in a hurry to fly. 2 - Forgot to connect the servo to the receiver. 3 - Didn't to a control check before taking off.

Luckily I immediately realized what was wrong when the plane got in the air and flew it back around and landed using the rudder. I sure was lucky. Now I have a checklist.