Had a mechanical cancellation in Montreal last year. For some reason, the GA printed up for me THREE food vouchers for USD 28 each, which could be used either at YUL or at my connection point EWR. Used one for a nice meal at YUL, used one at EWR for a box of pastries to take home, and the last at EWR Starbucks for a pile of muffins that I gave to my favorite ground staff agent at my home airport upon arrival.
On a previous trip, gave my voucher to a family waiting in line for breakfast at a concourse eatery.