As many have noted, the first day of Chanukah coincided with Christmas this year (December 25, 2016).
For completeness, here are the co-occurrences of the first day of Chanukah and Christmas during the past 400 years:
And here are the next two hundred years:
Users of hebcal for UNIX can verify this for themselves using a command like the following:
./hebcal --years 600 1617 | \ grep 'Chanukah: 1 Candle' | \ grep '^12/24' | \ cut -c 7-10