Getting shottied in the face by a hunter who has blink jump and teleports right in front of your face, getting killed by hunter blade dance, getting killed by Titan smash when you've spent a good few seconds getting the Titan down to 5% only to have h become invincible and smash you, getting nuked right after you've grabbed heavy ammo, getting killed by a fusion rifle from across the map, just a few I wanted to mention