The large semi that was tailgating you and in fact nearly driving over you 5 minutes ago....
stuck behind:
The smoking crappy little 4-door POS that's in the fast lane and travelling about 10 miles under the speed limit that you were stuck behind 2 minutes ago...
and knowing that it won't be able to pass it because immediately next to the POS you have:
A large, equally slow moving, cargo truck.
Heh, that made my morning earlier.
Now, back to your regularly scheduled grind...