I would give you karma but I'd take greater delight in banning you instead. 

Banned for taking the beep out of the jeep.

Banned for beeping the jeep.  

I would give you karma but you're banned for prolonged beeping and giving me the horn.

I would give you karma but, I thought you would like to hear that old AAaOOooga melody. 

I would give you karma but now I have that tune in my head and I can't concentrate on anything else.

Banned for 'horning'.

Banned for rhinoceri might see it differently.

Banned because the Wooly said so.

Banned for consorting with Maxwell's Demon.

I would give you karma but I played with Maxwell's Silver hammer, and therefore you're banned for indulging in the horizontal

I would give you karma but all of us are banned for not paying attention to the OP.

Edit: starkers edited before me.

I would give you karma but the wind changed while I was pulling a funny face and now I'm stuck like this  forever.

I would give you karma but...oops!

I would give you karma but, caffeine is better.

I would give you karma but that is way toooooooooo much caffeine.

At least grind the beans first.

I would give you karma but, it was rather weak. 

*bouncing off walls now*

I would give you karma but,  a bottomless cup will do that. haha

I would give you karma but the booger monster just emerged from the bottomless pit and ate all the cookies.

I would give you karma but did you chase down the booger monster and wipe his nose?

I would give you karma but, the news is on.

I would give you karma but I'm too giddy to think straight.

I would give you karma but, how's the weather up there.   Enjoy Uvah.

Wonderful for a change.

I would give you karma....oh what the hey...karma 4 u

I would give you karma but, Yay for Wonderful.  haha       It's your turn for happiness and sharing it cinches the deal.