Birthday Roses

A blonde and a brunette were having lunch one day. The brunette seemed to be preoccupied with something. Trying to be a good friend, the blonde asked her what was on her mind.
The brunette replied,
"My boyfriend just got me a dozen roses for my Birthday!"
The blonde then said,
"Oh that’s good!"
"Well, not really," mused her brunette friend, "They always come with an obligation… I’ll have my legs in the air for three days now!"
Puzzled, the blonde asks,
"Oh my, that is awful… don’t you have a vase?"