What makes you think that career opportunities are limited? There are lots of jobs available for up and coming scientists.
Depending on what you specialize in at university, decides which area you are capable of working in.
The best one I have ever heard about was awesome:
The students went to some council workers who were digging up the road near their school, and told them that some other students were dressing up as police and were coming down to arrest them. They then went to the police and told them that some...