This whimsical illustrated chart by Aaron Thong shows some alternate uses for portals, like the ones created by the handheld portal device carried by the main characters in the Portal video game series.
You'd better ask for permission from GLaDOS before attempting these unauthorized uses of your portal gun, or you may be taken offline. Skydiving seems like a fun way to use a portal, but hula hooping looks downright dangerous!
Link --via JazJaz