I used to think that the lyric in Deck the Halls was "'tis the season tube-ey, jolly." Tube-ey as in another word for tubular.
A childhood belief about misheard lyrics

others believed things like this
- if you eat toothpaste straight from the tube, you will get worms— wormelow
- I used to want hemmoriods so I could use a "float tube" in the tub and have a cushy toilet seat like my dad.— Tami
- my friend thought that the film 'the hulk' was about the jolly green giant from the sweetcorn adverts.— patticus
- I thought I would fall through the cracks in my grandmother's deck.— Hannah
- I always wondered why shepherds washed their socks by night. (correct lyric: watched their flocks)— MaggieNJ
- A common misheard lyric in BMTH’s ‘Shadow Moses’ is “THIS IS SANDPIT TURTLE!”— Oli