  We present the results of a search for stellar flares from stars neighbouring
the target sources in the Kepler short cadence data. These flares have been
discarded as contaminants in previous surveys and therefore provide an
unexplored resource of flare events, in particular high energy events from
faint stars. We have measured M dwarf flare energies up to 1.5$\times$10^35
erg, pushing the limit for flare energies measured using Kepler data. We have
used our sample to study theflaring activity of wide binaries, finding that the
lower mass counterpart in a wide binary flares more often at a given energy. Of
the 4430 flares detected in our original search, 298 came from a neighbouring
star, a rate of 6.7$\pm$0.4 per cent for the Kepler short cadence lightcurves.
We have used our sample to estimate a 5.8$\pm$0.1 per cent rate of false
positive flare events in studies using TESS short cadence data.
