"I guess the driver of that X2 was really happy with him or herself."
and @rkaufman noticed the following in a tweet:
"Route sign on bus leaving #brookland: 'H6:)' Part of #wmata's new friendly image?"
We asked Metro if the characters were part of an effort to cheer up downtrodden commuters, and they said "there is nothing being done like this. If extraneous characters appear, it is by gremlin or accident."
Have a nice commute :)