A proper relaxing s
hit. One of those ones where you feel about two stone lighter.
As said, sneezing. Rolled up tissue induced sneezing to be specific.
Squeezing a nail infection so the pus explodes everywhere (only ever had one), similar is if you had a TB jab in school and it got infected, picking the scab when it's a lump and bulging full of pus and it all just oozes out like when you poke a yolk on a lightly fried egg with a fork
Squishing your eyes when shut so you see different colours.
Chest infections and coughing up proper thick loads of brightly coloured phlegm.
Giving yourself cramp in your foot.
Also I've not had this before but self removal of a botfly looks like it'd be fun. The relief once it comes out >>>