Sorry guys but that COULD be a serious post!
Studies have shown that people going at speed X on a clear day feel like they are going much faster than when travelling at speed X on a foggy day. In other words, with the spedometer disabled, people who attempt to go the speed limit go much faster on foggy days than on clear days.
The fog makes you 'feel' like you are going slower than you actually are. Maybe cr4zymofo lets his windshield get so dirty that it gives him the effect of fog. Thus he FEELS like he is going slow all the time. When cr4zymofo finally washes his windshield, he FEELS like he is going faster.
Link on the issue
"Fog can trick drivers into thinking their speed is far slower than it actually is, according to a paper in the April 2nd [1998] issue of the journal Nature."
It is a real effect. However, I voted 'no' since I don't let my windshield get very dirty.