What the blooming?

A few days ago, I noticed this weed-looking growth spurting from one of our mother-in-law's tongue plant (also known as snake plant and sansevieria trifasciata). At first sight I thought "Ack! How could a weed grow in my indoor potted plant?" but then I googled around a bit and confirmed my suspicions with my mom, that in fact is my plant is in bloom.

I have never seen a snake plant bloom, and neither has my mom, so this event is exciting for me, especially since I think my mom has the greenest thumbs around. In the morning the blooms are shut (photo above), but later in the day the blooms open up (photo below).

I don't know what I did to encourage the bloom, but my mom said that the plant must be happy. So, in trying not to make it mad, I will continue caring for it just the same and maybe next time there will be more than one bloom to report.