It depends on who you are with. If you are with someone you enjoy, you will naturally be more receptive to having fun. Many times just people's mere presence make you more or less receptive to having fun. People can also affect things in the opposite manner. I used to have a friend who was so pessimistic that you could go to a comedy show and not have a good time because they would whine before, during and after the show. Heck, the mere thought that they were coming over would ruin your day.