Omg some creative person help please this is GOOD!?

i was in my schools soccer team there mascot are bears and i switched schools and now the school am in the mascot is a cougar and am gonna play a match against my old school and i still support there team better cause ive been in that school 4 ever so i want to make a funny shirt so when i play against my friends in the other school i can show them my shirt that am gonna wear under my uniform i want to show them that i still support there team lol but i want it to be funny like a funny joke what is something funny i can do??? oh would u need the schools name or something? or can u make up something supper funny with out the school name?