1st place:Doctor: WATER? YOU GOT ME WATER? WHAT GOOD IS THAT?
Donna: Well you could always use the Sonic Screwdriver to activate the non-isotopic detection system, using a biotin-avidin coupling, flow cytometry that then ignites hydrogen atoms into plasma.
Doctor: ..what?
Donna: What?
By Patar - well done!
2nd place:
Donna: I thought it would be bigger.
By Will
3rd place:
Doctor: Well, I might have had something to do with the first James Bond movie too...
By Nyraeve