  The orbits of some warm Jupiters are highly inclined (20$^\circ$-50$^\circ$)
to those of their exterior companions. Comparable misalignments are inferred
between the outer and inner portions of some transition discs. These large
inclinations may originate from planet-planet and planet-disc secular
resonances that sweep across interplanetary space as parent discs disperse. The
maximum factor by which a seed mutual inclination can be amplified is of order
the square root of the angular momentum ratio of the resonant pair. We identify
those giant planet systems (e.g. Kepler-448 and Kepler-693) which may have
crossed a secular resonance, and estimate the required planet masses and
semimajor axes in transition discs needed to warp their innermost portions
(e.g. in CQ Tau). Passage through an inclination secular resonance could also
explain the hypothesized large mutual inclinations in apsidally-orthogonal warm
Jupiter systems (e.g. HD 147018).
