The Office (UK series)/WMG

Both the British and the American series are in the same continuity.
And eventually, Michael and David will have an all-out duel between each other.
 * Let's hope Dwight and Gareth face off.
 * Dunder Mifflin will be bought out by newly successful British paper company Wernham Hogg, and Tim will be the new VP/CFO/whatever.
 * Parks and Recreation takes place in the same universe as well. When all three shows crossover, there will be a three-way fistfight between David, Michael, and Leslie which will somehow end up with them all in a threesome together. Also Karen Filippelli and Ann Perkins will be revealed to be twins Separated at Birth and they will pull a Twin Switch, Parent Trap style.
 * CONFIRMED!: In "The Seminar" (7x14 of the US series), Michael meets David in a lobby and they discuss acting techniques.
 * Also, after Michael leaves, David Brent makes a brief return as one of the candidates for Michael's old job.