on break of cobweb:
set {_i::*} to all items
remove bedrock, obsidian and any spawn egg from {_i::*}
set {_r} to random element out of items
set {_max} to max stack size of (type of {_r})
set {_i} to random integer between 1 and {_max}
send "Max stack size: %{_max}%" to player
cancel drops
set {_item} to {_i} of {_r}
drop {_item} at event-block
show small smoke at event-block