Naturally occuring tactics

Hello everyone!

I donno about you, but personally, when I learn chess, I like connecting new concepts to ones I already know. Keeping this in mind, what traps/early tactics do you guys know that occur before move 10, and arise from a specific opening variation? (if you don't get the question yet, check out the examples I listed below).

Examples:

One of the most known example of this is the Fried Liver attack, where after 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5, and if Black plays something inaccurate like 4. ... Nxd5?, 5. Nxf7 follows forking the Queen and the Rook, with 6. Qf3 afterwards (following 5. ... Kxf7). This early sacrifice leads to a winning position for White, and therefore is an example of a tactic occuring on move 5.

In the Vienna Gambit (after 1. e4 e5 2. Nc3 Nf6 3. f4), if Black makes the disasterous move 3. ... Bd6??, then after 4. fxe5 Bxe5 5. d4 Bd6, 5. e5 is what I'd call a 'naturally occuring' pawn fork.

In the Englund Gambit Accepted, after 1. d4 e5 2. dxe5 Nc6 3. Nf3 Qe7 4. Bf4 Qb4+ 5. Bd2 Qxb2 and 6. Bc3, we can yet another 'naturally occuring' tactic, namely a crosspin, in the move 6. ... Bb4.