One day, while we were on the phone, he found himself standing behind the couch (he may have been lounging on the back of the couch? Or something?) with a need to get out.
So he tried sidling out. This did not work, as the couch was pushed up tightly against the wall; the reason he could be where he was standing was because there was a window behind the couch, and that created enough space for him to stand. So he tried pushing the couch.
This was even less successful. As he probably should have already known, but discovered loudly right in my ear, the windowsill behind him housed his mother and stepfather's reasonably impressive collection of potted cacti. Pushing the couch forward meant pushing his bottom backward, and behind him was not open air, but a tasteful selection of succulents with thorns.
Of course, neither of his parents were home to push the couch to let him out. He was stuck.
After I stopped giggling at his expense, I suggested that he fall forward, letting his torso down onto the couch, and his feet would follow, and all would be good. He argued with me a little, and continued in his fruitless attempts to push the couch forward for a bit (spearing himself on the cacti behind every time) but after he got tired of playing pincushion with his butt, he followed my advice and escaped.