That feeling when your friends' college life kind of depends on you helping them out in this assignment using a low level programming language (low level means it was meant to operate on the machinery level) that you were really good in at the first semester. Then you realize that you have forgotten a lot of things just because the logic and approach ist totally different from the high level programming language and you forget how a programming language works once you stop using it and it takes time to dive back in and you really like being friends with them. Now all you're left with is with the fear of letting them down.