Once upon a time I was given a helium foil balloon as part of a goodie bag from a job interview (long story - I also got an ipad, one of the first in the UK). I brought the helium balloon home with me, just for its novelty - I hadn't had a helium balloon in many, many years.
I weighted it for neutral buoyancy - this required slight re-weighting every so often as it lost volume. It became almost like a pet, following people around the house in their wake, drifting around depending on the airflow - this often leads upstairs because warm air rises - and yes, one night it did make its way into the bedroom.
It was more charming in an anthropomorphised sense, though, and in no way scary or disturbing.
I weighted it for neutral buoyancy - this required slight re-weighting every so often as it lost volume. It became almost like a pet, following people around the house in their wake, drifting around depending on the airflow - this often leads upstairs because warm air rises - and yes, one night it did make its way into the bedroom.
It was more charming in an anthropomorphised sense, though, and in no way scary or disturbing.