Need to know: Save up to 78% on entry to Foster's Comedy Live plus a classic burger for two people; Enjoy some top-notch comedy and good grub too!; What & why: They say that laughter is the best medicine, and who are we to argue? If that’s the case, then today’s kgbdeal could cure you of pretty much anything! Prepare to laugh your socks off, split your sides and guffaw like a ticklish hyena. Oh, and leave room for something to eat, too! For just £10 you and a friend can enjoy entry to Foster's…