Yes, folks. That's how much a single letter can change a word's meaning ! And yes, the montage was made by me. 

The correct form is Força Barça, but most keyboards in this world don't have the ç so international fans always end up saying Forca Barca - which means the already mentioned above-.

Want to say it correctly without embarrassing yourself in front of Catalan people or Spaniards (Because yes, barca also means boat in Spanish, not only in Catalan)?

You can try:

Visca el Barcelona!

(Long life to Barcelona!)

or

Vinga Barcelona !

(Come on/Go Barcelona!)

Just a tip for you, soccer fans ;)