the colloquial British expression 'to blind [someone] with science'
cary grant uses this phrase in this movie. only other time i've heard this expression was in thomas dolby's one-hit wonder by the same name.
"the colloquial British expression "to blind [someone] with science", meaning to deliberately confuse someone by giving the impression of highly complex knowledge. In the song, however, the phrase is interpreted as a straightforward reference to the natural sciences." Wikipedia
"We deal in lead, friend."