There was this website I saw a while back that had like 250 ways to annoy people.
okay here is one of them from google: http://www.dbooth.net/internerd/annoy.cfm
Anyways I was thinking of like what if there was a list like that for people that are being a Dungeon Master or a Game Master for that matter.
heres a few I came up with so far:
1.when the characters got to a moderately high level say they encounter like an orc. just like one first level orc.
2. instead of treasure being gold pieces all the time say they have found electrum pieces instead which is like equal to half a gold piece.
3. this is one I used to do is give the party a protection from cantrips spell scroll all the time. which is probably one of the most useless spells. It would probably be used if you had a campaign in a wizardry school and you were roleplaying and stuff. It wouldnt be much good in a dungeon or a battle tho.