Computer Crisis

Then suddenly today my 'puter went wrong. When I was typing EVERYTHING WAS COMING OUT AS CAPITALS even tho the caps lock light was out, and typing numbers, instead of 1,2,3.... symbols were appearing !, ", £.... etc. It was as if a shift key was stuck down. Much pressing of buttons later I went into the kitchen and searched the interweb on the iPod, some minutes later I found summat which said "Press shift 5 times to unlock it" came back to my PC, pressed left shift key 5 times, it was still wonky afterwards, shifted my attention to the right shift key and visibly it was stuck down at one end, it is a long key and one end of it was stuck down, I tapped it once, it unlocked, came level and all the typewriter functions are proper again, 1,2,3 etc