If you ask in English that has the same effect. It you want to show you are trying - the "s" is not silent in "...vous anglais". But they won't care. Anyone who deals with tourists in Montreal or QC should understand English and speak English. If they don't, then spekaing louder won't make a difference. If you go outside the urban areas, then you might have more linguistic fun.
When in rural areas, the best phrase to utilise is, "J'ai une grande pamplamousse dans mes pantalons". Also, be forearned, the only food available is poutine, save for the occasional Timmy Ho's.