I ran across a short inflation clip years ago, and I'm wondering if anyone knows the source movie. (Looks very '80s.) It's not a spectacular inflation, but I like it. Maybe the embroidered letters on the sweaters are a clue?
Three cheerleaders are lamenting the end of their high school careers as sexpots in fluffy sweaters. Then the two on the sides turn to the cheerleader in the middle and make a ripcord-pulling action, causing the center cheerleader's breasts to inflate like balloons (along with suitable hissing noises). The enhanced cheerleader then floats up out of frame.
I don't know the movie, but this makes me curious too. Sounds like an interesting scene