Don't neglect the health habit. Substitute the tennis racquet for the cigarette, one of these days, and note the difference. It may make you feel like a King in the pink of condition; after which you'll probably try it again, which won't hurt you a bit.
JOKES
Don't repeat all the jokes that come into your head. Avoid especially jokes that may be old. Many a fellow's popularity may hinge on the fact that he'll listen to a funny story without insisting on telling another that isn't quite so funny.
SHOWING OFF
Don't, if you are from a large well-to-do Preparatory School, talk too much about it, or think that the College must be run on the same plan as your school. Your views may not be appreciated.
SWAGGERING
Don't aspire to be taken for an upper-classman by cultivating a walk or a swagger or an air. You can work this so hard, that finally you are the only one deceived.
ROWDYISM
Don't be rowdyish, or get the reputation of being a drunken fellow. The real fun you get out of College need not be a continual round of batting.