As reported on the weekend NASA had troubles getting soil the Mars Lander Phoenix collected into its little oven to analyze it.

Through vibrating the filter the Mars soil samples moved inside the tiny oven. The Thermal and Evolved-Gas Analyzer instrument, or TEGA, for Phoenix actually has eight separate tiny ovens to bake and sniff the soil to assess its volatile ingredients, such as water.
More proof, if you still need it, that NASA scientists are all kids at heart is in the names they gave the trenches Phoenix dug. The left one in the photo above is called "Dodo" and the right one is called "Baby Bear".

The sample Phoenix is currently analyzing is from Baby Bear.
More details on the NASA site.