I am dm to a 3.5 game that includes; sycorax, a three foot tall halfling wizard, an insatiable half-elf cleric-paladin, an elven ranger who has a quite large collection of tame beasts, and finally there is Tug, a human barbarian who always seems to get nat twenties when he really wants them. ( I've checked his dice, it's hard to believe his luck.) at level 3 he successfully bear hugged an owlbear that was kicking their butts for 3 full rounds while his companions leisurely dispatched the creature. Later on, he managed to peacefully get a brontosaurus to follow him to a beast master at a large fighting arena ( which I made as difficult as I could but he out rolled every check) then made the beast master promise to have it tame in a year. I charge him like 2,000gp but still. He didn't roll under a 17 in like six rolls in a row. Not that he never rolls crit fails but when he really needs it the gods smile upon him even though Tug kneels before no god or man.
I have a Tug at my table, haha. This player is almost always the party rogue as well. Recently he was a ranger though, and after the party killed an owl bear they wanted to track it down. I came up with some on the fly numbers of progressively harder checks to be able to track back to its lair. The first check was moderate and the more difficult from there, but of course he ends up rolling 15, 17, 19. I have taken to having everyone roll into a dice tower now, myself included so as to ensure that all things are on the uppest of ups, haha. I think every table has a Tug, and often an anti-Tug.