One good comeback that is quite well known is from Bradford Northern in the early 90s. 'Supersub' Paul Medley had a habit of closing his eyes/blinking just as the ball came to him and so as consequence knocked on quite a bit when running onto the ball. Anyway in one game Bradford were attacking the line and a forwrd knocked on from an easy pass.
Apparently at this the Bradford Coach (I think it was Peter Fox) jumped out of the dugout and screamed 'Medley you useless ****er, open yer bloody eyes!' Only problem was that Medley was sat further down the bench next to him at the time.
Medley says: 'But boss, it wasn't me, I'm sat right here!'
To which Fox replies 'Aye, well you would have done the same thing if it was you.'

Yesterday at Salford the Touchjudge disallowed a David Faiumu try as held-up even though it was clear he grounded the ball before being lifted up by the defenders, when we scored a legit one a few minutes later the crowd were singing to the linesman involved "are you sure its a try" to which Referee Hicks was trying his damndest to control his laughter and ended up laughing as Brough took the conversion , he knew it was a mistake but credit to him for seeing the funny side.

Not the greatest comeback but I found the response funny. Neil Baynes was warming up on the touchline for salford at warrington. A group of young kids were calling him fat and offering him a bite of their pie. Baynes responded "I may be fat but at least I'm not small"

I was told a tale about St John Ellis when he played for Cas against Halifax, just before half time Singe punched the Fax wiger after he had tackled him, ref called Singe over. Singe protested that the Fax player had grabbed his privates, the ref just waved him away. Just before the teams were about to come out for the 2nd half Singe walked up behind the ref and gave his privates a little tweak, the ref yelped, Singe just said, "it effing hurts doesnt it"

A couple that stick in my memory, it was Cardiff magic weekend and a group of us were sat at the front. It was Wire v Salford and from the kick off we'd been giving it loads to Korkidas chanting "Morley's gona get ya" Korkidas drops the ball, turns round and gives us the scariest look I've ever had! Another funny moment although not with a player, we'd been to a World Club game at Huddersfield and coming out of the ground we'd all needed to empty ourselves so coming back over the grassy hill there was a couple of policewomen waiting for us. One of them asked us, "so what have you 3 been up to then?" one of the lads quickly came back with,"wouldn't you like to know". Childishly we bursted out laughing and the policewomen just smiled shaking their heads telling us to move on.

You shot Kennedy???