At first I was offended by my confusion but now I find it really funny.

The joke is that she obviously is neither of the two. I think it may be a gag based on how easily the words are thrown around. A similar example of ridiculous labeling would be like saying you've been anorexic all night since dinner. The eCard is just ridiculous and not a stab at mental illness.

Speaking of throwing the word bipolar around: I've heard Ohio's weather described as being bipolar (as I'm sure most other states have) but this week I now firmly believe that Ohio can't make up it's mind: Single digits yesterday, 70's today, forecast raging storms tomorrow with snow on Thursday.

Rapid Cycler if there ever was one.