Pruned branches that won't come out of the tree (apple, etc.) no matter how hard you try...
Nicking your hand with the Silky...
Sap on your rope that won't slide thru your hitch...
The Pantin that unexpectedly comes off the rope...
Not hitting the target on the first throw, pulling it out, and having the throwline land in brush, sticks, leaves, or anything else that will make it into a birds nest (throwing from a driveway is bliss)...
Groudies that are still in the drop zone when your saw is running and 'clear' has been yelled...
When a rope won't slide thru a crotch because the throwline is running thru some flaky bark...
The log that swings into the trunk and gives you a better ride than six flags (actually it's fun - most of the time)
Ear muffs on my Husky helmet that get caught on branches...
Customers watching (while in the drop zone!)
And much more...