You want to know something about Heineken Cup semi-finals records...
Toulouse and Munster will both wear red in the semi-finals - and they will have the home dressing rooms at Twickenham and the Ricoh Arena respectively.
Saracens will wear their traditional all black strip and London Irish will be wearing their green and white jersey.
The 24 semi-finals so far have produced 70 tries - an average of almost three a match.
London Irish and Saracens are making their Heineken Cup semi-final debuts while Toulouse are appearing in their eighth and Munster their seventh semi-finals respectively.
The most points scored in a tournament semi-final is 37 - by Leicester against Toulouse at Welford Road in 1996 / 1997 and by London Wasps against Munster at Lansdowne Road in 2003 / 2004.
Five Munster players - Ronan O'Gara, Peter Stringer, John Hayes, Donncha O'Callaghan and Anthony Foley - have appeared in a record six semi-finals.
The most points scored in a semi-final is 69, when London Wasps beat Munster 37-32 at Lansdowne Road in 2003 / 2004. The match also produced the most tries scored - seven.
Only two players have scored two tries in a semi-final. Stade Francais Paris back row forward Christophe Juillet crossed the Ulster Rugby line twice at Ravenhill in 1998 / 1999 and Paul Sackey got a brace for London Wasps against Northampton Saints at the Ricoh Arena last season.
Outside half Ronan O'Gara is the only player to kick two drop in a semi-final, for Munster against Toulouse at Le Stadium in 2002 / 2003.
The 2003 / 2004 semi-finals had the greatest combined attendance of 82,500 when the ties were played at Lansdowne Road (Munster v London Wasps, 48,500) and at Stade Chaban-Delmas in Bordeaux (Toulouse v Biarritz Olympique, 34,000). That Munster v London Wasps attendance is the tournament record for a semi-final.
The most penalty goals kicked by a player is the seven landed by Llanelli Scarlets outside half Stephen Jones against Northampton Saints at the Madejski Stadium in 1999 / 2000.
The only semi-final requiring extra time was the 1998 all-French clash between Toulouse and Brive. Toulouse lost that one on a 2-1 try count.
The 24 Heineken Cup semi-finals played so far have been watched by 614,817 fans - an average attendance for each of those semi-finals of 25,617.
The biggest winning margin is 27 points, when Toulouse beat Swansea 30-3 in 1996.
Two clubs have scored five tries in a semi-final, Leicester Tigers against Toulouse in 1997 and London Wasps against Munster in 2004, while only one semi-final has failed to produce a try - Biarritz Olympique's 18-9 win over Bath Rugby in San Sebastian in 2006.