Nobody reacted to an ejection better than Bobby Valentine and his very fake mustache

The Mets weren't having very much fun to start the 1999 season. A team that entered Spring Training with real postseason aspirations found itself bickering in the clubhouse and floundering on the field -- and things threatened to come to a head on June 9, 1999, against the Blue Jays.
A recent five-game losing streak left New York at just 30-28 entering play that night, a full six games back of the rival Braves in the NL East. After being shut out for most of the night by David Wells, the Mets needed a three-run rally in the ninth just to force extra innings. Then, in the top of the 12th, they found themselves on the wrong end of a controversial call.
With Toronto's Shannon Stewart on first, manager Bobby Valentine called for a pitchout, suspecting that Stewart might try to steal to put the go-ahead run in scoring position. Sure enough, he was right: Stewart took off for second, and as pitcher Pat Mahomes delivered, it looked as though New York's plan would work to perfection ... until home-plate umpire Randy Marsh called catcher's interference, ruling that Piazza had stepped too far out while receiving the pitch.
What could have been two outs and no men on turned into one out and men on first and second. Valentine, as you might imagine, was not pleased:

Marsh eventually ran Valentine from the game, leaving the team upset and in a jam without their manager -- the perfect encapsulation of everything that had gone wrong for New York thus far that season. But Mahomes eventually got out of the inning, and in the bottom half, Bobby V turned the whole scene on its head:

Rather than simply sulking in the clubhouse, Valentine did his best Groucho Marx routine, heading back up towards the dugout in a disguise he'd fashioned out of a black hat, a pair of sunglasses and a fake mustache made out of two stripes of eye-black. The Mets and the broadcast booth couldn't stop laughing, and hey, maybe it worked: In the bottom of the 14th, Rey Ordonez finally ended the game with a walk-off single.
The league office, however, wasn't as amused. NL president Leonard Coleman fined Valentine and suspended him for two games, despite Valentine's protestations to the contrary. ("One of the pictures, it looks like I was in the dugout, doesn't it?" he told the New York Times in one of the richest quotes in baseball history. "It must've been someone else who looked like me.")
The skipper eventually dropped his appeal and accepted the punishment. But did he regret doing it? Well, yes and no.
"I regret it," he said. "It's going to cost me a lot of money. I don't regret the fact that it lightened the team."