I know this link has been presented on BAUT (and probably BABB and UT) but I think it is worth another showing:

Top 10 Things I hate About Star Trek

From there:

For cripes sake Giordi, stop reversing the polarity of everything! [snip] Every time the Enterprise comes in for its 10,000 hour checkup, they've gotta go through the whole [darn] ship fixing stuff. "What happened to the toilet in Stateroom 3?" "Well, the plumbing backed up, and Giordi thought he could fix it by reversing the polarity."

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The Leif Ericson Cruiser