+===asked===
+ mal {de-adv} :: {colloquial} short for einmal, indicates that something is needed; can replace bitte in very informal situations
+ Haben sie ’ne Uhr? (’Do you have a clock?’) :: Could be interpreted as an implication that the person asked is unreliable
+ Haben sie mal ’ne Uhr? :: Indicates that the question is asked because the asker is in need of a clock rather than for other reasons
+ Haste Feuer? (D’ya have fire? (i.e. a lighter)) - More likely to be asked when the asker has a lighter himself and wants to offer it :: --
+ Haste mal Feuer? - The asker needs a lighter but doesn’t have one. :: --
+===asker===
+ mal {de-adv} :: {colloquial} short for einmal, indicates that something is needed; can replace bitte in very informal situations
+ Haben sie ’ne Uhr? (’Do you have a clock?’) :: Could be interpreted as an implication that the person asked is unreliable
+ Haben sie mal ’ne Uhr? :: Indicates that the question is asked because the asker is in need of a clock rather than for other reasons
+ Haste Feuer? (D’ya have fire? (i.e. a lighter)) - More likely to be asked when the asker has a lighter himself and wants to offer it :: --
+ Haste mal Feuer? - The asker needs a lighter but doesn’t have one. :: --