Whats the name of a 80s movie

[mickey]

Colourfull comedy, where a couple(m/f) is chasen by a mean old-witch-look-a-like lady in wheelchair and her bullies. At a time the couple run through a helium factory(?) where they´re voices gets funny=o) and the couple get up to the roof and my memory is lost ;-)

[thatboy]

Broadway Danny Rose?

[mickey]

no it´s not, but funny clip ;-)

this factory in my memory is very light, almost laboratory-like