Two scientists walk into a bar. The first scientist says ""I'll have h2o"" The second scientist says ""I'll have a water"" The first scientist goes back home and rethinks his assassination plan.

Two scientists walk into a bar... The first scientist says to the bartender, ""I'll have some H2O."" The bartender nods and gives the man a glass of water. The second scientists says, ""I'll have some H2O, too."" The bartender nods and gives the man a glass of water as well, because he speaks English and understands that the second scientist, rather than requesting a drink which would kill him, simply wanted a glass of water in addition to his friend's.

most intellectual joke Two scientists walk into a bar. The first scientist says , ""I'll have some H2O"". The second scientist says, ""I'll have a glass of water,too. By the way, why did you say H2O? Like, know it's a chemical formula for water and all, but it's the end of the day and there's really no need to intentionally over-complicate things like that in a situation outside of work"" The first scientist stares at his drink, angry that his assassination plot has failed.

Two scientists walk into a bar... ...the barman asks: ""What would You like to order, sir"" to which the first scientist answers: ""I would like to order a glass of H2O"". Then the second scientist says: ""I would like to have a glass of H2O too."", he drinks it and dies. (If you don't get it just comment and I will axplain it to you, because we all know that every joke is funnier when it's explained)