That is from the Video Game Portal and Portal 2. Its about you being trapped in a facility that was designed to bend Physics with the aid of your Portal Gun.
But it is taken over by its Manic Computer GLaDOS, which you must escape of course.
You are given tests to preform in order to get out, GLaDOS lies to you and promises you Cake once you are done and that she is NOT trying to kill you like the other test subjects who left you clues on how to get out (and the fact that the cake was a lie)
Then you come a cross a "Companion Cube" just a box with hearts on it, but it serves as a Psychological Experiment that if you are TOLD an object is important will will safeguard it. After your tests with the Companion Cube GLaDOS forces you to through it in the furnace, again as a Psychological test and to screw with you. You then must Destroy GLaDOS and escape.
Portal 1 and 2 have a HUGE following on the internet and many memes have arisen from it.
I was just trying to by funny.
Merry Christmas Chode.
P.S. You should hear what they say about when life gives you lemons.