As told to me by my son...
There's a fella at work, dead skinny, a bit wierd, he gets all excited and wide eyes if he's telling you something...but a nice, no harm kinda guy...
So they're all yakking and skinny guy suddenly gets all excited and pipes up...
'I'm having a tribble tommorrow'
'Eh, a tribble ? what the hell are you talking about
'A tribble, i'm getting one after work tomorrow !!!'
They all looked at each other, my son said to him 'Danny, what the hells a tribble ?'
'You get it at a tatoo place'
'Danny, you mean a tribal
'oh, errr......yeah'