About 5 years ago flying JFK-LWB and delayed due to lack of sodas. The catering truck forgot to deliver our sodas so we had to wait for them to come back. First they went to the wrong plane, we waited some more and they finally arrived with the precious cargo. After loading in the galley the pilot said they forgot to load Diet Coke, only regular Coke, so we had to wait for yet another delivery. Total delay 1.5 hours on a 1 hour flight, and sadly only a single beverage service despite being well stocked.