I have two guinea pigs, one is black and one is brown. The black one is named Mr.Moo and the brown one is Porkchop.
Sometimes, while we're watching, my dad and i will let my guinea pigs run around upstairs. They usually don't go far so we had no problem with it.
One day while they were running around Porkchop ran behind our couch. He just sat in one spot and neither me or my dad could reach him. We moved the couch and were able to get porkchop and put him in his cage.
After a while we put Mr.Moo in his cage too. Clyde watched them for a while, then later on, we ,for some reason, thought it'd be a great idea to bring them outside.
While the guinea pigs were outside Mr.Moo got out of his cage and ran under the fire pit( we luckily weren't having a fire that moment) We got him out from under there and decided we should bring both Mr.Moo and Porkchop inside and not to bring them back outside ever again.
We brought them inside ,safe and sound, and just let them relax for the rest of the day.