Get first and last line from a file

I needed to get only first and last line from a file (actually, not a file, but rather output from another command). head -1 and tail -1 can be used to get either first or last, but how to combine the two at the same time? Here’s how. Enter tee:

cat somefile | grep something | tee >(head -1) >(tail -1) > /dev/null

Neat, huh?