  We investigate the criterion, on the Born-Infeld background fields, for the
open string pair creation to occur in D$p$-(anti-)D$p$-brane systems. Although
the pair creation occurs generically in both D$p$-D$p$ and D$p$-anti-D$p$
systems for the cases which meet the criterion, it is more drastic in
D$p$-anti-D$p$-brane systems by some exponential factor depending on the
background fields. Various configurations exhibiting pair creations are
obtained via duality transformations. These include the spacelike scissors and
two D-strings (slanted at different angles) passing through each other. We
raise the scissors paradox and suggest a resolution based on the triple
junction in IIB setup.
