The Eve landing and return mission caught me out. I didn't know anything about Eve and accepted the contract. I barely made it off Eve and back to Kerbin even with every cheat in the F12 menu on.
A lot of the contracts I get don't make much sense or are horribly repetitive. It seems like they taylor the contracts based on what you've chosen in the past. Which makes sense considering that's probably the type on contracts your interested in but I can only repair so many rovers or satellites before it gets dull.