Did you know? O_o

[FML|Renaud]

http://classic.battle.net/war3/basics/heroes.shtml

If a player owns only one hero (dead heroes count), and is at tier 2 (Keep/Stronghold etc) or Tier 3 (Castle/Fortress etc), they gain bonus experience of 15% for tier 2 and 30% for tier 3. This affects all experience gain - both creeping and killing enemy units.

Fun to note, you also gain less xp creeping, based on your level
80% => 70% => 62% => 55% => 0%

[FML|Renaud]

Other fun things
Howl lvl 3 + Cripple = -100% damage (unit still do a little bit sometimes, because of the random)
Haze lvl 3 + Curse is NOT 100% miss, mathematically i would say ~87%, but from test i think it was higher... will test again!

Edit: tsk... such a pain to test, count the hit and miss... fuck it! well lets just say its 87%!
one in every 7.6 attack, instead of one in every 5 attack (haze only)