Yahtzee
Five of a kind on the first throw happens once in 1,296 rolls. With the full three rolls, keeping whatever number you have most of and rerolling the rest, it comes up about 4.5% of the time, roughly one turn in 22.
This roller throws all five at once. To reroll only some, set the count to the number of dice you are picking up and roll those.
Poker dice and Liar's Dice
Poker dice score five dice like a poker hand: pairs, three of a kind, a full house, straights. In Liar's Dice every player hides five dice under a cup and bids on how many of a face are on the whole table. With five dice each, any one face shows up on average once in every six dice, which is the number every bid is quietly measured against.
Five d6 in D&D
5d6 is a 9th-level rogue's Sneak Attack. The d6 page lists the rest of the places the six-sider turns up.