As a kid watching MacGyver meant discovering new ways to get out of dangerous situations I would probably never really find myself in during my lifetime.
This knowledge didn't help for much more than creating new ways to kill player characters in roleplaying games, but applying the MacGyver technique to life certainly made things more convenient.
When you go with what you've got you can work MacGyver-esque miracles with stuff you have laying around the house or were probably going to throw away, like using a squirt bottle to make pancakes or sealing a plastic bag with the top of a soda bottle.
For more simple ideas that are simply brilliant check out Lifehacker's Top 10 Awesome MacGyver Tricks That Speak For Themselves and MacGyver your way to convenience!