Well, not in the type shown in horror films where a supposed swarm of killer bees would attack the aircraft and through whatever means, get inside the aircraft and attack the passengers, biting many to death. More of a kind where it was not safe for the plane to take off with so many bees all around. If a bee got into the plane, it would be unsafe, similarly, if a bee got into the wiring or anything like that, it would be unsafe. As a result, the flight had to be delayed until the bees were removed and there was no threat to either the passengers or the flight because of the bees (link to article):
The bees flew from under a wing, some attached themselves to the wing, while others covered windows of the Airbus-319. Two ambulances were called to the plane amid fears that the bees might get inside the cabin. Airport staff then 'efficiently and quickly' removed the bees from the plane's fuselage, 'metro.co.uk' reported. The flight was delayed by slightly under an hour. It is not the first time bees have caused problems for an aircraft.