That feeling you get when you plan a Jool penta-mission, build the ship, launch it perfectly, set up a perfect encounter, get to your first target for deploying your first satellite (Tylo in this case), get a circularized polar orbit, start collecting science, and.....realize that you forgot to add communication equipment. On every. single. satellite. *facedesk* Things like that make me want to write a Grandma Kerbal mod. She'd pop up and say things like "Remember to deploy your solar panels before time warp!", "Unless you like confetti at your launches, tuck those solar panels in!", "That probe isn't going to do much without an antenna!", and "Lithobraking is bad for your kerbals. Are you sure you don't need chutes on that lander?"