Hey there..
It's a late 80s or early 90s comedy wherein the late father of this kid created a scientific potion to turn invisible after one drank & took their clothes off.However, it never worked cause the missing ingredient was pigeon-sh*t that the son later realized by accident while working on his dads formula.I guess his principal or someone is after this secret potion too.
A part of the movie that I remember real well is when this kid hides under the table of the proncipal or a teacher & that person farts leaving the kid breathless.
Please let me know if you know the title to this movie... Thanx.

The name of the movie is The Invisible Kid. It came out in the late 80s.

Thanks jjwoodhull! Been lukin around a while now.