Capture the flag is a good one, a bunch of us used to play it with an old school bmx top tube pad. The idea was to steal it off someones bike without being caught, and whoever took it to the pub on fridays won. Much easier then this.
There was an annual event in Vancouver called ‘messengers of doom’.
every one who entered received a ‘card’ with another entrants name. the aim was to ‘tag’ the person who’s card your received. ‘tagging’ was done via water (pistol/balloon/etc).
When tagged by someone you had to handover the card you were hunting.
person with the most ‘tags’ at the end of the day wins.
i used to take long lunches and find excuses to be out of the building on that day as it was hilarious watching all the couriers move around the city. different lockup spots, different bikes, disguises (bag and clothing swaps). no-one trusted anyone… one year there was a 10+block chase through the city as one person tried to tag another. you would get DQ’d for ringing in a fake job though.
they also gave prizes for best outfit and a few other amusing categories at the pub at the end of the day.
A similar game used to happen on film sets. There’s a clothes peg that you try to clip onto someone’s clothing without them noticing (usually on their back). Person wearing the peg when wrap is called at the end of the day, buys a slab.