Care to share your "Damnit! It fled!" moments you have?

A Venusaur just yesterday. Probably my only chance to ever catch a wild Venusaur. Fortunately, the really important Pokemon like Dragonite, Snorlax and Lapras never fled from me so far.

My second wild encountered Dragonite!
It was the week before Christmas, some degree above freezing. It had rained the whole day, I had walked around for more than eight hours.

I was cold, wet, hungry, tired and had problems operating the mobile with my stiff fingers. Just about to give up for the day.

Then it suddenly spawn just in front of me, 2300CP. The adrenaline started to pump. All my tireness went away. I got under a small roof. Carefully wiped the screen dry. Razzberry, Ultraball, tried to do my best curveball with frozen fingers. I caught it directly (Yes!), but right afterwards it broke out and vanished in smoke. I was left in the cold rain, silently watching the screen in disbelief.

The only wild Lapras I have seen fled...during the 'Water' event.

My first wild Snorlax fled...in the second week of my account.

My second wild encounter of Dragonite fled - my first encounter happened when I was completely out of pokeballs. Needless to say, I have never let myself run out of pokeballs entirely again.

Wild Machamp, 100+CP, Ultra ball, Curve Throw, Excellent Throw..... ran away. LOL.

Too many other bad ones to remember, I'm pretty sure a good Aerodactyl had jumped away from me but Machamp sticks out for being a different sort of experience!

A dragonite with DT/O .. my gf caught it after 10+ ultraballs.. for me it fled on the second ultra..2 days ago

I also had a Charizard 1800 and Dragonite 1200 run away from me. They would have been new Pokedex entries but ya know. Also this Gyarados would have been nice but I have two others. I ran out of my house for this and ran after 2 ultra balls =/

98% Dragonite with 2872 CP and Dragon Tail & Outrage moveset.

Curved Great Ball, Great Throw, Razz Berry and it fled after first throw. I'm stilled pissed off about it more than a month later.

The only wild Gyarados I've ever seen. In my house. :(

2 Togetics fled; 1 at a PokéStop, but couldn't reach it because of the weird GPS drifts. 2–3 more seen at other pokéstops, away from my house.

1 Piloswine fled!

The very first wild Charmeleon I encountered last summer ran away.

My worst is not a fled. My worst is wild Rhydon that when I hit him to catch my game said error and he was just gone. Worst fled was high CP Vape during the water event.